What’s Vulnerable › Vulnerabilities

CVE-2021-22870: Path traversal in GitHub Enterprise Server hosted Pages leads to unauthorized file read access

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-10 · updated 2026-06-17
• Weakness: CWE-23

Description

A path traversal vulnerability was identified in GitHub Pages builds on GitHub Enterprise Server that could allow an attacker to read system files. 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 3.3 and was fixed in versions 3.0.19, 3.1.11, and 3.2.3. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: before 3.0.19; from 3.1.0 before 3.1.11; from 3.2.0 before 3.2.3 — fixed in 3.0.19, 3.1.11, 3.2.3

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.0.19, 3.1.11, 3.2.3. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.19
• https://docs.github.com/en/enterprise-server%403.1/admin/release-notes#3.1.11
• https://docs.github.com/en/enterprise-server%403.2/admin/release-notes#3.2.3
• https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.19
• https://docs.github.com/en/enterprise-server%403.1/admin/release-notes#3.1.11
• https://docs.github.com/en/enterprise-server%403.2/admin/release-notes#3.2.3

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