Authorization Bypass in GitHub Enterprise Server Allows Unrestricted Pull Requests
CVE-2026-1999

7.2HIGH

Key Information:

Vendor

Github
Status
Enterprise Server
Vendor
CVE Published:
18 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-1999?

An authorization bypass vulnerability in GitHub Enterprise Server allows attackers to merge unauthorized pull requests into repositories. This issue particularly affects repositories that permit forking and occurs when attackers exploit the enable_auto_merge mutation through their own fork. The attack requires certain conditions like a clean pull request status and branches without branch protection rules. This vulnerability has been addressed in versions 3.19.2, 3.18.5, and 3.17.11, following reports via the GitHub Bug Bounty program.

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Affected Version(s)

Enterprise Server 3.14.0

Enterprise Server 3.14.0 < 3.14.22

Enterprise Server 3.15.0 < 3.15.17

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

automerge-test
Created by jwde

References

https://docs.github.com/en/enterprise-server@3.14/admin/r...
https://docs.github.com/en/enterprise-server@3.15/admin/r...
https://docs.github.com/en/enterprise-server@3.16/admin/r...

CVSS V4

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ahacker1
JSON
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