CVE-2026-5512
Improper Authorization in GitHub Enterprise Server Exposes Private Repo Names
Publication date: 2026-04-21
Last updated on: 2026-04-29
Assigner: GitHub, Inc. (Products Only)
Description
Description
CVSS Scores
EPSS Scores
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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 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an improper authorization issue in GitHub Enterprise Server. It allows an authenticated attacker to discover the names of private repositories by their numeric IDs. The problem occurs because the mobile upload policy API endpoint does not perform an early authorization check, and validation error messages reveal the full repository names even when the caller does not have access to those repositories.
How can this vulnerability impact me? :
The vulnerability can impact you by exposing the names of private repositories that should remain confidential. An attacker with authenticated access could use this flaw to gather information about private repositories, potentially leading to further targeted attacks or information leakage.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade your GitHub Enterprise Server to one of the fixed versions: 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, or 3.14.26.