Private code disclosure via cross-repository comparisons
Published Aug 26, 2025 · Updated Aug 26, 2025
Improper access control in GitHub Enterprise Server 3.14 through 3.17 allows remote authenticated users to read limited private code. The compare/diff function accepts a cross-repository reference and returns code from a target repository without checking the requesting user's read authorization. Exploitation requires access to any repository plus the private repository name and a usable branch, tag, or commit SHA; disclosure is limited to code exposed by the generated diff.
Summary
What happened
Improper access control in GitHub Enterprise Server 3.14 through 3.17 allows remote authenticated users to read limited private code. The compare/diff function accepts a cross-repository reference and returns code from a target repository without checking the requesting user's read authorization. Exploitation requires access to any repository plus the private repository name and a usable branch, tag, or commit SHA; disclosure is limited to code exposed by the generated diff.
The record
- CVE
- CVE-2025-8447
- Published
- Aug 26, 2025
- Updated
- Aug 26, 2025
- Vendor
- Product
- GitHub Enterprise Server
- Classifications
- CWE-639, T1213.003
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 26, 2025CVE publishedPublication date reported by the CVE source.
- Aug 26, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.14 <=3.14.16 changes=[{"at":"3.14.17","status":"unaffected"}]
- Affected versionversion=3.15 <=3.15.11 changes=[{"at":"3.15.12","status":"unaffected"}]
- Affected versionversion=3.16 <=3.16.7 changes=[{"at":"3.16.8","status":"unaffected"}]
- Affected versionversion=3.17 <=3.17.4 changes=[{"at":"3.17.5","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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