CVE-2026-103620 | BDVDB-2026-383571 Detail
GitHubEnterprise Server
Description#
A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. This vulnerability was reported via the GitHub Bug Bounty program.
Impact#
CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
Weaknesses#
- CWE-862 Missing Authorization
References#
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.16
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.13
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.9
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.7
- https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.2
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.