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CVE-2026-18730

7.4 · HIGH

A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause the Manage API to send crafted outbound requests to a…

Published Sep 1, 2026githubCWE-918EPSS 0.48%

Overview

CVE-2026-18730 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 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause the Manage API to send crafted outbound requests to an attacker-controlled host. An unauthenticated endpoint parsed an attacker-supplied cluster configuration and issued gateway-to-agent requests whose HMAC authenticated only a timestamp, not the request path or body. An attacker positioned to intercept the outbound request could capture this token and replay it against privileged management agent endpoints. High-availability deployments were not affected due to a topology restriction. This vulnerability affected GitHub Enterprise Server releases in the 3.17, 3.18, 3.19, 3.20, and 3.21 series and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. 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, < 3.17.19Affected

References

GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.17.21GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.18.15GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.19.12GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.20.8GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.21.6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-18730?

CVE-2026-18730 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 7.4 (HIGH).

How severe is CVE-2026-18730?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-18730?

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-2026-18730?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-18730 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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