Missing Authorization in Gitea - CVE-2026-103670
Published: October 19, 2026
Vulnerability identifier: #VU156100
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-103670
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cancel trusted CI runs and disrupt deployment workflows.
The vulnerability exists due to missing authorization checks in Gitea's run-level concurrency handling when inserting workflow runs for unapproved fork pull requests. A remote user can open a fork pull request whose workflow run shares a concurrency group with a trusted run to cancel that run when cancel-in-progress is enabled, potentially leaving deployments partially completed.
Affected software
Gitea
How to mitigate CVE-2026-103670
Install security update from vendor's website.
Gitea - update to 28.0.0