CVE-2021-22863
mediumpriority · track · 32EPSS 0.010 · 63 %ileEUUSEPSS · scored 2026-10-27
An improper access control vulnerability was identified in the GitHub Enterprise Server GraphQL API that allowed authenticated users of the instance to modify the maintainer collaboration permission of a pull request without proper authorization. By exploiting this vulnerability, an attacker would be able to gain access to head branches of pull requests opened on repositories of which they are a maintainer. Forking is disabled by default for organization owned private repositories and would prevent this vulnerability. Additionally, 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 2.12.22 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⚠ sources disagree · medium–high · 5.5–8.1
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
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan