CVE-2026-5512 Information disclosure in Enterprise Server

Medium 5.3 Published 21 Apr 2026 Updated 22 Apr 2026

Authenticated attackers can disclose private repository names via the mobile upload policy API due to missing authorization checks.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-5512?

CVE-2026-5512 is a medium-severity vulnerability in Github Enterprise Server, published on 21 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-201

Which versions are affected by CVE-2026-5512?

It affects 1 product.

Products include Github Enterprise Server.

How do I fix CVE-2026-5512?

No fix has been published for CVE-2026-5512 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-5512 being exploited?

There is no known exploitation of CVE-2026-5512 in the wild and no public exploit code.

All Github Enterprise Server vulnerabilities

Sources

Also known as GHSA-28fv-vpxc-gmp4.