Published: 03/03/2021 Updated: 07/11/2023

CVSS v2 Base Score: 4 | Impact Score: 2.9 | Exploitability Score: 8

CVSS v3 Base Score: 6.5 | Impact Score: 3.6 | Exploitability Score: 2.8

VMScore: 356

Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N

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.

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NVD-CWE-Other https://docs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24 https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15 https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7 https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1 https://nvd.nist.gov

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CVE-2021-22861

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