# CVE-2026-15343: Path traversal vulnerability in GitHub Enterprise Server allowed writing files to arbitrary repository paths, including GitHub Actions workflow files, via unchecked Dependabot dependency-file paths

> CVE-2026-15343: Path traversal vulnerability in GitHub Enterprise Server allowed writing files to arbitrary repository paths, including GitHub Actions workflow files, via unchecked Dependabot dependency-file paths. CVSS 8.6 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-15343
Last updated: 2026-10-24T20:10:00Z

- Published: 2026-07-17 15:18 UTC · Updated: 2026-10-24 20:10 UTC · Assigner: GitHub\_P
- CVSS: 8.6 (CVSS 4.0) · Severity: High
- EPSS: 0.75%, 55th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-22

## 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.

## Affected vendors and products

- GitHub: Enterprise Server

## Tracked companies

- [GitHub](https://rewindex.com/company/github.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-15343)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-15343)
- [https://docs.github.com/en/enterprise-server@3.17/admin/release-notes\#3.17.18](https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18)
- [https://docs.github.com/en/enterprise-server@3.18/admin/release-notes\#3.18.12](https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12)
- [https://docs.github.com/en/enterprise-server@3.19/admin/release-notes\#3.19.9](https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9)
- [https://docs.github.com/en/enterprise-server@3.20/admin/release-notes\#3.20.5](https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5)
- [https://docs.github.com/en/enterprise-server@3.21/admin/release-notes\#3.21.3](https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-15343 · Markdown: https://rewindex.com/cve/CVE-2026-15343.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-15343 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:26.469Z