Vulnerability-Lookup

GHSA-G7MM-9VX7-JM7H

Vulnerability from github – Published: 2026-07-14 19:00 – Updated: 2026-07-14 19:00

Summary

Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation

Details

Impact

A vulnerability in Woodpecker CI's gRPC layer allowed any authenticated agent to impersonate any other agent on the same server by injecting a forged agent_id value into outgoing gRPC metadata. The server correctly verified the JWT token but then discarded the verified agent identity in favor of the client-supplied value.

Patches

Direct patch: https://github.com/woodpecker-ci/woodpecker/pull/6567 Later proper fix: https://github.com/woodpecker-ci/woodpecker/pull/6569

Workarounds

Disable org agents (WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true) and delete existing ones

Resources

Public ref: https://github.com/woodpecker-ci/woodpecker/issues/6541 Private com: https://github.com/woodpecker-ci/woodpecker-security/issues/21

Severity

7.1 (High)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "go.woodpecker-ci.org/woodpecker/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.14.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-50141"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-290",
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-14T19:00:29Z",
    "nvd_published_at": "2026-06-18T14:17:29Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nA vulnerability in Woodpecker CI\u0027s gRPC layer allowed any authenticated agent to impersonate any other agent on the same server by injecting a forged `agent_id` value into outgoing gRPC metadata. The server correctly verified the JWT token but then discarded the verified agent identity in favor of the client-supplied value.\n\n### Patches\nDirect patch: https://github.com/woodpecker-ci/woodpecker/pull/6567\nLater proper fix: https://github.com/woodpecker-ci/woodpecker/pull/6569\n\n### Workarounds\nDisable org agents (`WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true`) and delete existing ones\n\n### Resources\nPublic ref: https://github.com/woodpecker-ci/woodpecker/issues/6541\nPrivate com: https://github.com/woodpecker-ci/woodpecker-security/issues/21",
  "id": "GHSA-g7mm-9vx7-jm7h",
  "modified": "2026-07-14T19:00:29Z",
  "published": "2026-07-14T19:00:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/woodpecker-ci/woodpecker/security/advisories/GHSA-g7mm-9vx7-jm7h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50141"
    },
    {
      "type": "WEB",
      "url": "https://github.com/woodpecker-ci/woodpecker-security/issues/21"
    },
    {
      "type": "WEB",
      "url": "https://github.com/woodpecker-ci/woodpecker/issues/6541"
    },
    {
      "type": "WEB",
      "url": "https://github.com/woodpecker-ci/woodpecker/pull/6567"
    },
    {
      "type": "WEB",
      "url": "https://github.com/woodpecker-ci/woodpecker/pull/6569"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/woodpecker-ci/woodpecker"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation"
}

CVE-2026-50141 (GCVE-0-2026-50141)

Vulnerability from cvelistv5 – Published: 2026-06-18 14:13 – Updated: 2026-06-18 16:10

Title

Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation

Summary

Woodpecker is a CI/CD engine. Starting in version 3.0.0 and prior to version 3.14.1, a vulnerability in Woodpecker CI's gRPC layer allowed any authenticated agent to impersonate any other agent on the same server by injecting a forged `agent_id` value into outgoing gRPC metadata. The server correctly verified the JWT token but then discarded the verified agent identity in favor of the client-supplied value. Version 3.14.1 patches the issue. As a workaround, disable org agents (`WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true`) and delete existing ones.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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 2026-06-18 15:21 UTC

CWE

CWE-290 - Authentication Bypass by Spoofing
CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/woodpecker-ci/woodpecker/secur…	x_refsource_CONFIRM
https://github.com/woodpecker-ci/woodpecker-secur…	x_refsource_MISC
https://github.com/woodpecker-ci/woodpecker/issues/6541	x_refsource_MISC
https://github.com/woodpecker-ci/woodpecker/pull/6567	x_refsource_MISC
https://github.com/woodpecker-ci/woodpecker/pull/6569	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
woodpecker-ci	woodpecker	Affected: >= 3.0.0, < 3.14.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-50141",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T15:21:39.524543Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-18T16:10:41.914Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "woodpecker",
          "vendor": "woodpecker-ci",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.14.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Woodpecker is a CI/CD engine. Starting in version 3.0.0 and prior to version 3.14.1, a vulnerability in Woodpecker CI\u0027s gRPC layer allowed any authenticated agent to impersonate any other agent on the same server by injecting a forged `agent_id` value into outgoing gRPC metadata. The server correctly verified the JWT token but then discarded the verified agent identity in favor of the client-supplied value. Version 3.14.1 patches the issue. As a workaround, disable org agents (`WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true`) and delete existing ones."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "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:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-18T14:13:38.065Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/woodpecker-ci/woodpecker/security/advisories/GHSA-g7mm-9vx7-jm7h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/woodpecker-ci/woodpecker/security/advisories/GHSA-g7mm-9vx7-jm7h"
        },
        {
          "name": "https://github.com/woodpecker-ci/woodpecker-security/issues/21",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/woodpecker-ci/woodpecker-security/issues/21"
        },
        {
          "name": "https://github.com/woodpecker-ci/woodpecker/issues/6541",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/woodpecker-ci/woodpecker/issues/6541"
        },
        {
          "name": "https://github.com/woodpecker-ci/woodpecker/pull/6567",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/woodpecker-ci/woodpecker/pull/6567"
        },
        {
          "name": "https://github.com/woodpecker-ci/woodpecker/pull/6569",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/woodpecker-ci/woodpecker/pull/6569"
        }
      ],
      "source": {
        "advisory": "GHSA-g7mm-9vx7-jm7h",
        "discovery": "UNKNOWN"
      },
      "title": "Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-50141",
    "datePublished": "2026-06-18T14:13:38.065Z",
    "dateReserved": "2026-06-03T18:49:32.275Z",
    "dateUpdated": "2026-06-18T16:10:41.914Z",
    "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.

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.