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CVE-2021-22863

8.1 · HIGH

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 permissio…

Published Mar 3, 2021CWE-285EPSS 1.00%

Overview

CVE-2021-22863 is a high-severity vulnerability. It was published on March 3, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubdocs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24GitHubdocs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15GitHubdocs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7GitHubdocs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1GitHubdocs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24GitHubdocs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15GitHubdocs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7GitHubdocs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-22863?

CVE-2021-22863 is a high-severity vulnerability. It was published on March 3, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-22863?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-22863?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-22863?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-22863 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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