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Vulnerability record · CVE-2026-76851 · published 1 September 2026

CVE-2026-76851: Github enterprise server server-side request forgery (ssrf) vulnerability

Github · Enterprise Server

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.

7.7 CVSS 4.0 High EPSS 0.83% · top 44.2% CWE-918 · Server-side request forgery (SSRF)
7.7CVSS 4.0 base score
0.83%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
8 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-76851), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.