CVE-2026-20912 Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure

What is CVE-2026-20912?

CVE-2026-20912 is a critical missing authorization vulnerability in Gitea Gitea, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.

Weakness: CWE-283, CWE-639, CWE-284

Which versions are affected by CVE-2026-20912?

4 open source packages ship an affected version, including github.com/go-gitea/gitea, gitea and code.gitea.io/gitea. It affects 1 product.

Products include Gitea Gitea.

How do I fix CVE-2026-20912?

Upgrade github.com/go-gitea/gitea to 1.25.4 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-20912 being exploited?

There is no known exploitation of CVE-2026-20912 in the wild and no public exploit code.

Other vulnerabilities in Gitea Gitea

• CVE-2026-60004 Gitea Code Injection Exploited Critical 9.8
• CVE-2026-73278 Gitea WebAuthn bypass during OAuth and OIDC sign-in Critical 9.8
• CVE-2026-94205 Gitea fork workflow approval bypass through maintainer-triggered events Critical 9.8
• CVE-2022-42968 Gitea vulnerable to Argument Injection Critical 9.8
• CVE-2021-45330 Improper Privilege Management in Gitea Critical 9.8

All Gitea Gitea vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as BIT-gitea-2026-20912, GHSA-4xx9-vc8v-87hv, GHSA-vfmv-f93v-37mw, GO-2026-4364.