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TI-2026-02855 Aliases CVE-2026-3307GHSA-9mpg-26vj-7vx3

Authorization bypass in GitHub Enterprise Server

Priority LOW 24CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed an attacker with admin access on one repository to modify the secret scanning push protection delegated bypass reviewer list on another repository by manipulating the owner_id parameter in the request body. Authorization was verified against the repository in the URL, but the action was applied to a different repository specified in the request body. The impact is limited to assigning existing trusted users as bypass reviewers; it does not allow adding arbitrary external users. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4 and 3.20.1. This vulnerability was reported via the GitHub Bug Bounty program.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0027 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GitHubEnterprise Server3.14.0 – 3.14.24; 3.15.0 – 3.15.19; 3.16.0 – 3.16.15; 3.17.0 – 3.17.12; 3.18.0 – 3.18.6; 3.19.0 – 3.19.3; 3.20 – 3.20.0—No fix listedCNA
  • Enterprise Server VendorGitHub Affected 3.14.0 – 3.14.24; 3.15.0 – 3.15.19; 3.16.0 – 3.16.15; 3.17.0 – 3.17.12; 3.18.0 – 3.18.6; 3.19.0 – 3.19.3; 3.20 – 3.20.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*before 3.14.26; 3.15.0 to before 3.15.21; 3.16.0 to before 3.16.17; 3.17.0 to before 3.17.14; 3.18.0 to before 3.18.8; 3.19.0 to before 3.19.5VulnerableGitHub
cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:*3.20.0VulnerableGitHub
  • cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions before 3.14.26; 3.15.0 to before 3.15.21; 3.16.0 to before 3.16.17; 3.17.0 to before 3.17.14; 3.18.0 to before 3.18.8; 3.19.0 to before 3.19.5 Vulnerable ·GitHub
  • cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:* Versions 3.20.0 Vulnerable ·GitHub

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3307
  2. 2026-10-03 Alias added: GHSA-9mpg-26vj-7vx3

References

Advisory 7

  • TI-2024-04632 An authentication bypass vulnerability was present in the GitHub Enterprise Server (GHES)… CVSS 4.0CRITICAL 10.0
  • TI-2024-00181 Unsafe Reflection in Github Enterprise Server leading to Command Injection CVSS 3.1CRITICAL 9.8
  • TI-2024-00466 Privilege Escalation by Code Injection in the Management Console in GitHub Enterprise Server CVSS 3.1HIGH 8.8
  • TI-2026-03340 Remote code execution via git push option injection in GitHub Enterprise Server CVSS 4.0HIGH 8.7
  • TI-2024-08804 Improper signature verification in GitHub Enterprise Server CVSS 4.0CRITICAL 9.5
  • TI-2026-08177 Server-side request forgery in GitHub Enterprise Server CVSS 4.0CRITICAL 9.2
See all 125 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences