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Vulnerability record · CVE-2026-15343 · published 17 July 2026

CVE-2026-15343: Path traversal 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 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.

8.6 CVSS 4.0 High EPSS 0.57% · top 55.0% CWE-22 · Path traversal Deferred
8.6CVSS 4.0 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-15343), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.