Vulnerability-Lookup

GHSA-2Q76-M6W6-QGC6

Vulnerability from github – Published: 2026-10-06 16:09 – Updated: 2026-10-06 16:09

Summary

Payload: Improper access control for MCP API keys

Details

Impact

Under certain conditions, an authenticated user could manage MCP API keys outside their intended account allowing an attacker to escalate privileges through account takeover.

Applications that do not use @payloadcms/plugin-mcp are not affected.

Patches

Users should upgrade to @payloadcms/plugin-mcp version 3.88.0 or later.

Workarounds

Upgrading is recommended. Until then, disable the MCP plugin or restrict MCP API-key management to trusted users.

Severity

8.6 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@payloadcms/plugin-mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.61.0"
            },
            {
              "fixed": "3.88.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-105806"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-06T16:09:31Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nUnder certain conditions, an authenticated user could manage MCP API keys outside their intended account allowing an attacker to escalate privileges through account takeover.\n\nApplications that do not use `@payloadcms/plugin-mcp` are not affected.\n\n### Patches\nUsers should upgrade to `@payloadcms/plugin-mcp` version `3.88.0` or later.\n\n### Workarounds\nUpgrading is recommended. Until then, disable the MCP plugin or restrict MCP API-key management to trusted users.",
  "id": "GHSA-2q76-m6w6-qgc6",
  "modified": "2026-10-06T16:09:31Z",
  "published": "2026-10-06T16:09:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/payloadcms/payload/security/advisories/GHSA-2q76-m6w6-qgc6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/payloadcms/payload/commit/025581d8c5ed836039ad85397288a30f0d3c11c1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/payloadcms/payload"
    },
    {
      "type": "WEB",
      "url": "https://github.com/payloadcms/payload/releases/tag/v3.88.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Payload: Improper access control for MCP API keys"
}

CVE-2026-105806 (GCVE-0-2026-105806)

Vulnerability from cvelistv5 – Published: 2026-10-06 15:35 – Updated: 2026-10-06 17:39

Title

Payload: Improper access control for MCP API keys

Summary

Payload is a free and open source headless content management system. In @payloadcms/plugin-mcp versions from 3.61.0 until 3.88.0, an authenticated user can manage MCP API keys outside the intended account, enabling privilege escalation through account takeover. This issue is fixed in version 3.88.0.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-06 17:34 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/payloadcms/payload/security/ad…	x_refsource_CONFIRM
https://github.com/payloadcms/payload/commit/0255…	x_refsource_MISC
https://github.com/payloadcms/payload/releases/ta…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
payloadcms	payload	Affected: >= 3.61.0, < 3.88.0
@payloadcms	plugin-mcp	Affected: >= 3.61.0, < 3.88.0

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-105806",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-06T17:34:09.694438Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-06T17:39:44.197Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "payload",
          "vendor": "payloadcms",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.61.0, \u003c 3.88.0"
            }
          ]
        },
        {
          "product": "plugin-mcp",
          "vendor": "@payloadcms",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.61.0, \u003c 3.88.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Payload is a free and open source headless content management system. In @payloadcms/plugin-mcp versions from 3.61.0 until 3.88.0, an authenticated user can manage MCP API keys outside the intended account, enabling privilege escalation through account takeover. This issue is fixed in version 3.88.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T15:35:17.028Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/payloadcms/payload/security/advisories/GHSA-2q76-m6w6-qgc6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/payloadcms/payload/security/advisories/GHSA-2q76-m6w6-qgc6"
        },
        {
          "name": "https://github.com/payloadcms/payload/commit/025581d8c5ed836039ad85397288a30f0d3c11c1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/payloadcms/payload/commit/025581d8c5ed836039ad85397288a30f0d3c11c1"
        },
        {
          "name": "https://github.com/payloadcms/payload/releases/tag/v3.88.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/payloadcms/payload/releases/tag/v3.88.0"
        }
      ],
      "source": {
        "advisory": "GHSA-2q76-m6w6-qgc6",
        "discovery": "UNKNOWN"
      },
      "title": "Payload: Improper access control for MCP API keys"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-105806",
    "datePublished": "2026-10-06T15:35:17.028Z",
    "dateReserved": "2026-10-05T20:37:19.365Z",
    "dateUpdated": "2026-10-06T17:39:44.197Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

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