What’s Vulnerable › Vulnerabilities

CVE-2025-23369: Improper Verification of Cryptographic Signature in GitHub Enterprise Server Allows Signature Spoofing by Improper Validation

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-21 · updated 2026-06-17
• Weakness: CWE-347

Description

An improper verification of cryptographic signature vulnerability was identified in GitHub Enterprise Server that allowed signature spoofing for unauthorized internal users. Instances not utilizing SAML single sign-on or where the attacker is not already an existing user were not impacted. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.12.14, 3.13.10, 3.14.7, 3.15.2, and 3.16.0. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: before 3.12.14; from 3.13.0 before 3.13.10; from 3.14.0 before 3.14.7; from 3.15.0 before 3.15.2 — fixed in 3.12.14, 3.13.10, 3.14.7, 3.15.2

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.12.14, 3.13.10, 3.14.7, 3.15.2. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server@3.12/admin/release-notes#3.12.14
• https://docs.github.com/en/enterprise-server@3.13/admin/release-notes#3.13.10
• https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.7
• https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.2

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