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VULNERABILITIES

CVE-2026-76851 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.20 [email protected]Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.14 [email protected]Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.11 [email protected]Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.20.7 [email protected]Release NotesVendor Advisory
https://docs.github.com/en/[email protected]/admin/release-notes#3.21.5 [email protected]Release NotesVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-918Server-Side Request Forgery (SSRF)[email protected]

Affected Products

ProductVersions
github enterprise server
< 3.17.20
>= 3.18.0, < 3.18.14
>= 3.19.0, < 3.19.11
>= 3.20.0, < 3.20.7
>= 3.21.0, < 3.21.5

CPE

  • cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-76851
NVD Published Date:
Sep 1, 2026
NVD Last Modified:
Sep 8, 2026
Source:
[email protected]
CVE-2026-76851 Details - Not Deferred