CVE-2026-20912

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

State: Published
Severity: 9.1 Critical
Published: Jan 22, 2026
Updated: Jul 15, 2026
Reserved: Jan 8, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	redhat-SADP

Weaknesses

CWE-284 Improper Access Control
CWE-639 Authorization Bypass Through User-Controlled Key
CWE-283 Unverified Ownership

Affected Products

Product	Versions
Gitea Open Source Git ServerGitea	1.25.3 and earlierAffected

References

GitHub Security Advisoryvendor-advisory
GitHub Pull Request #36320patch
GitHub Pull Request #36355patch
Gitea v1.25.4 Releaserelease-notes
Gitea v1.25.4 Release Blog Postrelease-notes
https://access.redhat.com/security/cve/CVE-2026-20912vdb-entry
RHBZ#2432219issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20912.json

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