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CVE-2026-15343VulnerabilityPublished Updated

GitHub Enterprise Server · Path Traversal Vulnerability Was Identified

Source GCVE Database

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Authoritative record:CVE-2026-15343· High 8.6

Not known to be exploited · CVSS 8.6 High · fixed in 3.22.3 : patch Enterprise Server soon.

Data as of 4 Nov 2026, 01:43 UTC

CVSS 4.0 base score
8.6High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_P)CVSS 4.08.6
Patch
Available – fixed in 3.22.3, 3.21.8, 3.20.10 +1
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Upgrade Enterprise Server to 3.22.3, 3.21.8, 3.20.10 or 3.19.14.

Affected software

ProductAffectedFixed in
GitHubEnterprise ServerAffected
  • >=3.19.0 <3.19.14
  • >=3.20.0 <3.20.10
  • >=3.21.0 <3.21.8
  • >=3.22.0 <3.22.3
  • =3.17.0
  • =3.18.0
Fixed in
  • 3.22.3
  • 3.21.8
  • 3.20.10
  • 3.19.14

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.

References

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