Threats Tagged 'cve-2026-76851'

A Server-Side Request Forgery (SSRF) vulnerability in GitHub Enterprise Server allowed remote code execution on affected instances. The flaw was due to insufficient network isolation, enabling malicious pre-receive hook code to impersonate internal services and redirect trusted requests to privileged services, resulting in elevated code execution. Exploitation required pre-receive hook networking to be enabled and either site administrator privileges or write access to a repository with a configured pre-receive hook. The vulnerability affected all versions prior to 3.22 and was fixed in several 3.17 to 3.21 patch releases.

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.