woodpecker-ci/woodpecker · Security
Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation
- GHSA ID
- GHSA-g7mm-9vx7-jm7h
- CVE ID
- CVE-2026-50141
- Severity
- high
- Published
- Updated
- CVSS v4
- 7.1 · 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
Description
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
CWEs
- CWE-290 · Authentication Bypass by Spoofing
- CWE-639 · Authorization Bypass Through User-Controlled Key
References
- https://github.com/woodpecker-ci/woodpecker/security/advisories/GHSA-g7mm-9vx7-jm7h ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-50141 ↗
- https://github.com/woodpecker-ci/woodpecker-security/issues/21 ↗
- https://github.com/woodpecker-ci/woodpecker/issues/6541 ↗
- https://github.com/woodpecker-ci/woodpecker/pull/6567 ↗
- https://github.com/woodpecker-ci/woodpecker/pull/6569 ↗
- https://github.com/advisories/GHSA-g7mm-9vx7-jm7h ↗