Vulnerability Description
A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker who had code execution inside the Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/ as the path validation did not check the effective path which the attacker could control through the dependency file's directory and symlink target. If the repository used a pull_request_target workflow or had auto-merge enabled, an injected workflow could execute with access to the repository's GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, 3.17.18.
Related Weaknesses (CWE)
References
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.18
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.12
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.9
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.5
- https://docs.github.com/en/[email protected]/admin/release-notes#3.21.3
FAQ
What is CVE-2026-15343?
CVE-2026-15343 is a documented vulnerability. A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker who had code execution inside the Dependabot updater container to write files to arbitrary repository...
How severe is CVE-2026-15343?
CVSS scoring is not yet available for CVE-2026-15343. Check NVD for updates.
Is there a patch for CVE-2026-15343?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.