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CVE-2023-23763: Information disclosure in GitHub Enterprise Server leading to private repository leakage

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-01 · updated 2026-06-17
• Weakness: CWE-200

Description

An authorization/sensitive information disclosure vulnerability was identified in GitHub Enterprise Server that allowed a fork to retain read access to an upstream repository after its visibility was changed to private. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.10.0 and was fixed in versions 3.9.4, 3.8.9, 3.7.16 and 3.6.18. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: from 3.6.0 before 3.6.18; from 3.7.0 before 3.7.16; from 3.8.0 before 3.8.9; from 3.9.0 before 3.9.4 — fixed in 3.6.18, 3.7.16, 3.8.9, 3.9.4

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.6.18, 3.7.16, 3.8.9, 3.9.4. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server@3.6/admin/release-notes#3.6.18-security-fixes
• https://docs.github.com/en/enterprise-server@3.7/admin/release-notes#3.7.16-security-fixes
• https://docs.github.com/en/enterprise-server@3.8/admin/release-notes#3.8.9-security-fixes
• https://docs.github.com/en/enterprise-server@3.9/admin/release-notes#3.9.4-security-fixes
• https://docs.github.com/en/enterprise-server@3.6/admin/release-notes#3.6.18-security-fixes
• https://docs.github.com/en/enterprise-server@3.7/admin/release-notes#3.7.16-security-fixes
• https://docs.github.com/en/enterprise-server@3.8/admin/release-notes#3.8.9-security-fixes
• https://docs.github.com/en/enterprise-server@3.9/admin/release-notes#3.9.4-security-fixes

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