CVE-2026-15343
highpriority · track · 0EPSS 0.008 · 55 %ileDEEUEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.2–8.6
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (15)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2418Microsoft GitHub Enterprise Server: Mehrere SchwachstellenDeutsch2026-07-19csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Microsoft GitHub Enterprise Server ausnutzen, um einen Denial of Service Angriff durchzuführen, Daten zu manipulieren, Code auszuführen und Informationen offenzulegen.
also known as (3)
Other names and identifiers for this entity.
sources
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references (15)
External citations — patches, advisories, analysis.
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18cnnvd
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12cnnvd
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9cnnvd
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5cnnvd
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3cnnvd
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18enisa_euvd
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12enisa_euvd
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9enisa_euvd
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