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Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed users with access to any repository to retrieve limited code content from another repository by creating a diff between the repositories. To exploit this vulnerability, an attacker needed to know the name of a private repository along with its branches, tags, or commit SHAs that they could use to trigger compare/diff functionality and retrieve limited code without proper authorization. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.18, and was fixed in versions 3.14.17, 3.15.12, 3.16.8 and 3.17.5. This vulnerability was reported via the GitHub Bug Bounty program.

PUBLISHED Reserved 2025-07-31 | Published 2025-08-26 | Updated 2025-08-26 | Assigner GitHub_P




HIGH: 7.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Problem types

CWE-639 Authorization Bypass Through User-Controlled Key

Product status

Default status
affected

3.14
affected

3.15
affected

3.16
affected

3.17
affected

Credits

furbreeze finder

References

docs.github.com/...nterprise-server@3.14/admin/release-notes

docs.github.com/...nterprise-server@3.15/admin/release-notes

docs.github.com/...nterprise-server@3.16/admin/release-notes

docs.github.com/...nterprise-server@3.17/admin/release-notes

cve.org (CVE-2025-8447)

nvd.nist.gov (CVE-2025-8447)

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