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CVE-2026-103620

6.5 · MEDIUM

A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL AP…

Published Oct 6, 2026githubCWE-862EPSS 0.50%

Overview

CVE-2026-103620 is a medium-severity vulnerability affecting github enterprise_server. It was published on October 6, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. 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>= 3.18.0, < 3.18.16Affected

References

GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.18.16GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.19.13GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.20.9GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.21.7GitHubdocs.github.com/en/[email protected]/admin/release-notes#3.22.2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-103620?

CVE-2026-103620 is a medium-severity vulnerability affecting github enterprise_server. It was published on October 6, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-103620?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-103620?

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-2026-103620?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-103620 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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