Authorization bypass through user-controlled key in Gitea - CVE-2026-78433
Published: August 31, 2026
Vulnerability identifier: #VU146346
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-78433
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper access control in the web attachment handler when handling attachment requests through a repository path other than the repository that owns the attachment. A remote attacker can request a private repository attachment through a public repository attachment path to disclose sensitive information.
Exploitation requires knowledge of a specific attachment UUID, and only attachments created before 16 January 2026 are affected.
Affected software
Gitea
How to mitigate CVE-2026-78433
Install security update from vendor's website.
Gitea - update to 1.27.3