CVE-2026-5512

4.3 MEDIUM
Published: April 21, 2026 Modified: April 29, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26
Source: product-cna@github.com
Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21
Source: product-cna@github.com
Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17
Source: product-cna@github.com
Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14
Source: product-cna@github.com
Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8
Source: product-cna@github.com
Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5
Source: product-cna@github.com
Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1
Source: product-cna@github.com
Release Notes Vendor Advisory

7 reference(s) from NVD

Quick Stats

CVSS v3 Score
4.3 / 10.0
EPSS (Exploit Probability)
0.0%
12th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

github