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CVE-2026-5512

Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API

Published: Apr 21, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-201
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.3%
Top 80.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-201

Affected Products

enterprise servergithubDevTools & CI
Enterprise ServerGitHubDevTools & CI
githubcommercialUSDevTools & CIaka github

Exploitability

Official Patch Available

References

https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26
docs.github.com
https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21
docs.github.com
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17
docs.github.com
and 4 more references View all →

Timeline

Published
Apr 21, 2026
Last Updated
Apr 29, 2026

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