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CVE PROGRAM SOURCE RECORD7.7 High

CVE-2026-76851

Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed remote code execution via network access from pre-receive hooks to internal services

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Status
Published
Published
Updated
Assigning organization
GitHub_P

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

GitHub Enterprise Server

Default version status: affected

  • 3.17.0 to ≤ 3.17.19affected
  • 3.18.0 to ≤ 3.18.13affected
  • 3.19.0 to ≤ 3.19.10affected
  • 3.20.0 to ≤ 3.20.6affected
  • 3.21.0 to ≤ 3.21.4affected
  • 3.22.0unaffected

References