What’s Vulnerable › Vulnerabilities

CVE-2023-6803: Race Condition allows Unauthorized Outside Collaborator

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-21 · updated 2026-06-17
• Weakness: CWE-367

Description

A race condition in GitHub Enterprise Server allows an outside collaborator to be added while a repository is being transferred. This vulnerability affected all versions of GitHub Enterprise Server since 3.8 and was fixed in version 3.8.12, 3.9.7, 3.10.4, and 3.11.1.

Affected products

• GitHub Enterprise Server: from 3.8.0 before 3.8.12; from 3.9.0 before 3.9.7; from 3.10.0 before 3.10.4; 3.11.0 — fixed in 3.10.4, 3.8.12, 3.9.7

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.10.4, 3.8.12, 3.9.7. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server@3.10/admin/release-notes#3.10.4
• https://docs.github.com/en/enterprise-server@3.11/admin/release-notes#3.11.1
• https://docs.github.com/en/enterprise-server@3.8/admin/release-notes#3.8.12
• https://docs.github.com/en/enterprise-server@3.9/admin/release-notes#3.9.7
• https://docs.github.com/en/enterprise-server@3.10/admin/release-notes#3.10.4
• https://docs.github.com/en/enterprise-server@3.11/admin/release-notes#3.11.1
• https://docs.github.com/en/enterprise-server@3.8/admin/release-notes#3.8.12
• https://docs.github.com/en/enterprise-server@3.9/admin/release-notes#3.9.7

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