CVE-2026-14340An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on publ…
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An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization check only verified that the installation had read permissions on the target repository rather than verifying that the token's installation was explicitly granted access to that repository. An attacker who obtained a victim's user-to-server token could create issues, issue comments, commit comments, and private vulnerability reports on any public repository, appearing as the victim user with no indication of the app involvement. This vulnerability was fixed by adding a repository scope check for user-to-server tokens issued by global apps. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.
- CVSS
- 5.0 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
github enterprise_server github:enterprise_server | before 3.16.20; from 3.17.0 before 3.17.17; from 3.18.0 before 3.18.11; from 3.19.0 before 3.19.8; from 3.20.0 before 3.20.4; from 3.21.0 before 3.21.2 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20product, release-notes
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17product, release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11product, release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8product, release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4product, release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.2product, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.