CVE-2026-6736 | BDVDB-2026-331111 Detail
GitHubEnterprise Server
Description#
An authentication bypass vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to create a local user account, bypassing the configured external identity provider. When external authentication was enabled, the signup endpoint did not properly enforce the authentication restriction, allowing account creation and session establishment without identity provider validation. The created account was limited to the default base permissions configured on the instance. Exploitation required network access to a GHES instance configured with an external authentication provider. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18.
Impact#
CAPEC-115 Authentication Bypass
Weaknesses#
- CWE-306 Missing Authentication for Critical Function
References#
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.18
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.15
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.9
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.