An improper access control vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with the ability to fork a repository to disclose Actions secrets for the parent repository of the fork. This vulnerability existed due to a flaw that allowed the base reference of a pull request to be updated to point to an arbitrary SHA or another pull request outside of the fork repository. By establishing this incorrect reference in a PR, the restrictions that limit the Actions secrets sent a workflow from forks could be bypassed. This vulnerability affected GitHub Enterprise Server version 3.0.0, 3.0.0.rc2, and 3.0.0.rc1. This vulnerability was reported via the GitHub Bug Bounty program.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Github | Github | 3.0.0 (including) | 3.0.0 (including) |
| Github | Github | 3.0.0-rc1 (including) | 3.0.0-rc1 (including) |
| Github | Github | 3.0.0-rc2 (including) | 3.0.0-rc2 (including) |