CVE-2021-22863 Improper access control in GitHub Enterprise Server leading to unauthorized changes to maintainer permissions on pull requests

2021-03-0303:25:23

CWE-285

GitHub_P

www.cve.org

8.2 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

54.0%

JSON

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.

CNA Affected

[
  {
    "product": "GitHub Enterprise Server",
    "vendor": "GitHub",
    "versions": [
      {
        "lessThan": "2.20.24",
        "status": "affected",
        "version": "2.20",
        "versionType": "custom"
      },
      {
        "lessThan": "2.21.15",
        "status": "affected",
        "version": "2.21",
        "versionType": "custom"
      },
      {
        "lessThan": "2.22.7",
        "status": "affected",
        "version": "2.22",
        "versionType": "custom"
      },
      {
        "lessThan": "3.0.1",
        "status": "affected",
        "version": "3.0",
        "versionType": "custom"
      }
    ]
  }
]