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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

• Severity: high (CVSS 8.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-10-24
• Weakness: 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 products

• GitHub Enterprise Server: from 3.17.0 through 3.17.17; from 3.18.0 through 3.18.11; from 3.19.0 through 3.19.8; from 3.20.0 through 3.20.4; from 3.21.0 through 3.21.2

References

• 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@3.19/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@3.21/admin/release-notes#3.21.3

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