Authorization bypass through user-controlled key in Gitea - CVE-2026-57886
Published: July 14, 2026
Vulnerability identifier: #VU137438
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57886
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose private attachment content.
The vulnerability exists due to authorization bypass through user-controlled key in web issue/comment attachment handling when updating issue or comment attachments with attachment UUIDs. A remote user can submit a known attachment UUID through issue or comment edit flows to disclose private attachment content.
The issue can also alter the attachment's logical issue or comment association, and exploitation requires knowledge of a high-entropy attachment UUID.
Affected software
Gitea
How to mitigate CVE-2026-57886
Install security update from vendor's website.
Gitea - update to 1.27.0