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CVE-2026-76851

8.8, high

GitHub Enterprise Server Server-Side Request Forgery Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
0.8% higher than 56.7% of scored CVEs
Exploitation
No public evidence
Published
1 Sept 2026a month ago

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.

Details

Vendor
GitHub
Product
Enterprise Server
Weakness
CWE-918 (opens in a new tab)
Status
Analyzed
Updated
8 Sept 2026
Assigner
product-cna@github.com

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

References 5

Advisories 5

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other GitHub CVEs

Every GitHub CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-96890 GitHub Enterprise Server Server-Side Request Forgery Vulnerability EPSS 0.5% 8.8, high
  • CVE-2026-77987 A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server EPSS 0.9% 9.8, critical
  • CVE-2026-18730 GitHub Enterprise Server Server-Side Request Forgery Vulnerability EPSS 0.3% 7.4, high
  • CVE-2026-19118 GitHub Enterprise Server Time-of-Check Time-of-Use Race Condition Vulnerability EPSS 0.7% 7.5, high

Beyond this page

Is CVE-2026-76851 in your network?

This page tells you how dangerous CVE-2026-76851 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-76851 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.