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CVE-2026-76851

8.8 · HIGH

A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance.

Published Sep 1, 2026githubCWE-918EPSS 0.83%

Overview

CVE-2026-76851 is a high-severity vulnerability affecting github enterprise_server. It was published on September 1, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from github. Update enterprise_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
githubenterprise_server>= 0, < 3.17.20Affected

References

GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.17.20GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.18.14GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.19.11GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.20.7GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.21.5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-76851?

CVE-2026-76851 is a high-severity vulnerability affecting github enterprise_server. It was published on September 1, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-76851?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-76851?

Check the references section for vendor advisories and patches from github. Update enterprise_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-76851?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-76851 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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