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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

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 · score source

EPSS

• CVE-2026-50141: 0.43% estimated exploitation activity in the next 30 days; percentile 37.05 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 agentid 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 (WOODPECKERDISABLEUSERAGENTREGISTRATION=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

Published by the source

14 Jul 2026, 19:00 UTC

Last modified by the source

14 Jul 2026, 19:00 UTC

Source last checked

26 Oct 2026, 15:24 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-g7mm-9vx7-jm7h

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# Patch Next advisory brief: CVE-2026-50141

Advisory: Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation
IDs: CVE-2026-50141, GHSA-g7mm-9vx7-jm7h
Record: https://patchnext.com/advisories/cve-2026-50141 (revision 1, source checked 26 Oct 2026, 15:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: go.woodpecker-ci.org/woodpecker/v3 3.14.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go go.woodpecker-ci.org/woodpecker/v3: affected >= 3.0.0, < 3.14.1; fixed in 3.14.1

## Suggested inspection (read-only)
- Go go.woodpecker-ci.org/woodpecker/v3: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on go.woodpecker-ci.org/woodpecker/v3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-g7mm-9vx7-jm7h (GitHub-reviewed advisory GHSA-g7mm-9vx7-jm7h lists affected ranges: Go go.woodpecker-ci.org/woodpecker/v3 >=3.0.0 <3.14.1)

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