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CVE-2026-1999

Incorrect Authorization vulnerability was identified in GitHub Enterprise Server that allowed unauthorized merging of pull requests PUBLISHED

Description (CNA)

An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to merge their own pull request into a repository without having push access by exploiting an authorization bypass in the enable_auto_merge mutation for pull requests. This issue only affected repositories that allow forking as the attack relies on opening a pull request from an attacker-controlled fork into the target repository. Exploitation was only possible in specific scenarios. It required a clean pull request status and only applied to branches without branch protection rules enabled. This vulnerability affected GitHub Enterprise Server versions prior to 3.19.2, 3.18.5, and 3.17.11, and was fixed in versions 3.19.2, 3.18.5, and 3.17.11. This vulnerability was reported via the GitHub Bug Bounty program.

Affected (CNA)

Vendor / productVersions
GitHub / Enterprise Serveraffected 3.17.0 before 3.17.11; affected 3.18.0 before 3.18.5; affected 3.19.0 before 3.19.2

CWE

CWE-863

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.