CVE-2021-22861
mediumpriority · track · 26EPSS 0.010 · 61 %ileEUUSEPSS · scored 2026-10-27
An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to gain write access to unauthorized repositories via specifically crafted pull requests and REST API requests. An attacker would need to be able to fork the targeted repository, a setting that is disabled by default for organization owned private repositories. Branch protections such as required pull request reviews or status checks would prevent unauthorized commits from being merged without further review or validation. This vulnerability affected all versions of GitHub Enterprise Server since 2.4.21 and was fixed in versions 2.20.24, 2.21.15, 2.22.7 and 3.0.1. This vulnerability was reported via the GitHub Bug Bounty program.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24cnnvd
- https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15cnnvd
- https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7cnnvd
- https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1cnnvd
- https://docs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24enisa_euvd
- https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15enisa_euvd
- https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7enisa_euvd
- https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1enisa_euvd
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