CVE-2026-50141
Woodpecker gRPC agent_id metadata can be spoofed- cross-tenant agent impersonation
Description
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.
INFO
Published Date :
June 18, 2026, 2:13 p.m.
Last Modified :
June 18, 2026, 2:13 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update Woodpecker CI to version 3.14.1 or later.
- Disable org agents via WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true.
- Delete existing agents.
- Verify agent impersonation is no longer possible.
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