CVE-2026-5512
Received
Received - Intake
Improper Authorization in GitHub Enterprise Server Exposes Private Repo Names
Vulnerability report for CVE-2026-5512, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-04-21
Last updated on: 2026-04-29
Assigner: GitHub, Inc. (Products Only)
Description
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 Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| github | enterprise_server | to 3.14.26 (exc) |
| github | enterprise_server | From 3.15.0 (inc) to 3.15.21 (exc) |
| github | enterprise_server | From 3.16.0 (inc) to 3.16.17 (exc) |
| github | enterprise_server | From 3.17.0 (inc) to 3.17.14 (exc) |
| github | enterprise_server | From 3.18.0 (inc) to 3.18.8 (exc) |
| github | enterprise_server | From 3.19.0 (inc) to 3.19.5 (exc) |
| github | enterprise_server | 3.20.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-201 | The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. |
