CVE-2026-5512

MEDIUM EPSS 21.3%
Published Apr 21, 20262mo ago · Modified Jun 17, 20261w ago
5.3 CVSS 4.0
Medium
Find Similar
Published Apr 21, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
5.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
21.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-201

Affected Products 7

VendorProductVersionRange
githubenterprise_server* <3.14.26
githubenterprise_server*≥3.15.0  –  <3.15.21
githubenterprise_server*≥3.16.0  –  <3.16.17
githubenterprise_server*≥3.17.0  –  <3.17.14
githubenterprise_server*≥3.18.0  –  <3.18.8
githubenterprise_server*≥3.19.0  –  <3.19.5
githubenterprise_server3.20.0any

References 7

  • docs.github.com https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26
    Release NotesVendor Advisory
  • docs.github.com https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21
    Release NotesVendor Advisory
  • docs.github.com https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17
    Release NotesVendor Advisory
  • docs.github.com https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14
    Release NotesVendor Advisory
  • docs.github.com https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8
    Release NotesVendor Advisory
  • docs.github.com https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5
    Release NotesVendor Advisory
  • docs.github.com https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1
    Release NotesVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.