CVE-2026-153438.6HighCWE-22

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

GitHub · Enterprise Server

Vendor fix available · Affected: GitHub Enterprise Server · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.2%probability of exploitation in the next 30 days

68th percentile

050100

Higher than 68% of scored CVEs

8.6HighCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker with code execution inside a Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/, because path validation did not check the actual write destination. The initial fix in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, and 3.17.18 was incomplete because validation checked the supplied symlink target, while the publisher wrote the file using its directory and name. Writing GitHub Actions workflow files required the Dependabot installation to have workflows: write permission. Depending on repository permissions and workflow configuration, including a relevant pull_request_target workflow or auto-merge, an injected workflow could execute with access to GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.23 and was fully fixed in versions 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

GitHub · Enterprise Serverfrom 3.17.0 before 3.17.*; from 3.18.0 before 3.18.*; from 3.19.0 before 3.19.*; from 3.20.0 before 3.20.*; from 3.21.0 before 3.21.*; from 3.22.0 before 3.22.*

On the Atlas

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Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Path Traversal · File and Path Handling
Vendor: GitHub
Published: July 2026
Band: Possible (1 to 10%), July 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-15343 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.