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Description

Woodpecker before 3.15.0 matches the ApprovalAllowedUsers bypass list against pipeline.Author. For the GitLab forge driver, pipeline.Author is populated from the git commit author name (commit.author.name) carried in the webhook payload, which is attacker-controlled and not verified by GitLab. A user who can open a merge request from a fork can set the commit author name to match an entry in ApprovalAllowedUsers, causing needsApproval to return false so the pipeline runs without the required approval. This defeats the fork-approval security boundary and allows execution of attacker-controlled pipeline steps on a Woodpecker agent and exfiltration of CI secrets exposed to the run. Other built-in forge drivers (Gitea, Forgejo, GitHub, Bitbucket) derive pipeline.Author from the forge-validated sender/actor identity and are not affected.

PUBLISHED Reserved 2026-06-30 | Published 2026-06-30 | Updated 2026-07-14 | Assigner VulnCheck




HIGH: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CRITICAL: 9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

Authentication Bypass by Spoofing

Product status

Default status
unaffected

Any version before 3.15.0
affected

Credits

George Chen finder

References

github.com/woodpecker-ci/woodpecker/releases/tag/v3.15.0 (Release Notes) release-notes

github.com/woodpecker-ci/woodpecker/pull/6653 (Fix PR) issue-tracking

github.com/...ommit/98faae778c953678944996c89ed99307d2f16a3d (Fix Commit) patch

www.vulncheck.com/...bypass-via-spoofable-commit-author-name third-party-advisory

cve.org (CVE-2026-58370)

nvd.nist.gov (CVE-2026-58370)

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