CVE-2026-45399: Open WebUI: Low-privilege authenticated users can enumerate and stop global background tasks, causing system-wide chat disruption
(updated )
Any authenticated user with low privileges can enumerate active background tasks across the system and stop tasks belonging to other users via the GET /api/tasks and POST /api/tasks/stop/{task_id} methods. This allows a casual user to disrupt system-wide chat usage by continuously canceling other users’ active tasks. This is a real authorization vulnerability affecting integrity and usability in multi-user deployments.
References
- github.com/advisories/GHSA-8jjp-r2w2-4v22
- github.com/open-webui/open-webui/commit/e7ff4768f8ffe1924b4576381c9e45e8a64350e4
- github.com/open-webui/open-webui/pull/23454
- github.com/open-webui/open-webui/releases/tag/v0.9.0
- github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22
- nvd.nist.gov/vuln/detail/CVE-2026-45399
Code Behaviors & Features
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