CVE-2026-76851 : faille élevée github enterprise server (CVSS 8.8)

A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance. Insufficient network isolation allowed malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests to a privileged service, leading to elevated code execution. Exploitation required pre-receive hook networking to be enabled and either site administrator privileges or write access to a repository containing a configured pre-receive hook. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program.

Sévérité

Élevée (CVSS 8.8)

Vecteur CVSS

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation active

Non signalée par la CISA

Publication

1 sept. 2026

Dernière mise à jour

8 sept. 2026

• github enterprise server

• Fiche CVE-2026-76851 sur le NVD (NIST)
• docs.github.com/en/enterprise-server@3.17/admin/release-notes
• docs.github.com/en/enterprise-server@3.18/admin/release-notes
• docs.github.com/en/enterprise-server@3.19/admin/release-notes
• docs.github.com/en/enterprise-server@3.20/admin/release-notes
• docs.github.com/en/enterprise-server@3.21/admin/release-notes