CVE-2021-22867: GitHub Enterprise Server

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A path traversal vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration options used by GitHub Pages were not sufficiently restricted and made it possible to read files on the GitHub Enterprise Server instance. To exploit this vulnerability, an attacker would need permission to create and build a GitHub Pages site on the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.1.3 and was fixed in 3.1.3, 3.0.11, and 2.22.17. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: before 2.22.17 (fixed in 2.22.17); from 3.0.0, before 3.0.11 (fixed in 3.0.11); from 3.1.0, before 3.1.3 (fixed in 3.1.3)

Published 2021-07-14. Last modified 2026-06-17.