CVE catalog
CVE-2026-14340
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 publi
- Severity
- Medium · CVSS 5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.43% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | enterprise_server | Not reported | 3.16.20 | fixed |
| Cpe | enterprise_server | Not reported | 3.17.17 | fixed |
| Cpe | enterprise_server | Not reported | 3.18.11 | fixed |
| Cpe | enterprise_server | Not reported | 3.19.8 | fixed |
| Cpe | enterprise_server | Not reported | 3.20.4 | fixed |
| Cpe | enterprise_server | Not reported | 3.21.2 | fixed |
| Cpe | enterprise_server | Not reported | 3.21.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | enterprise_server | cpe | Not reported | 3.16.20 | Not reported | Not reported | Not reported |
| Cpe | enterprise_server | cpe | Not reported | 3.17.17 | Not reported | Not reported | Not reported |
| Cpe | enterprise_server | cpe | Not reported | 3.18.11 | Not reported | Not reported | Not reported |
| Cpe | enterprise_server | cpe | Not reported | 3.19.8 | Not reported | Not reported | Not reported |
| Cpe | enterprise_server | cpe | Not reported | 3.20.4 | Not reported | Not reported | Not reported |
| Cpe | enterprise_server | cpe | Not reported | 3.21.2 | Not reported | Not reported | Not reported |
| Cpe | enterprise_server | cpe | Not reported | 3.21.2 | Not reported | NVD-CVE-2026-14340 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20]
- [https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17]
- [https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11]
- [https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8]
- [https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4]
- [https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.2]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-14340]