High severity7.1GHSA Advisory· Published May 15, 2026· Updated May 19, 2026
CVE-2026-45399
CVE-2026-45399
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, 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. This vulnerability is fixed in 0.9.0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | < 0.9.0 | 0.9.0 |
Affected products
2<= 0.8.12+ 1 more
- (no CPE)range: <= 0.8.12
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: <0.9.0
Patches
Vulnerability mechanics
References
6- github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-8jjp-r2w2-4v22ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45399ghsaADVISORY
- github.com/open-webui/open-webui/commit/e7ff4768f8ffe1924b4576381c9e45e8a64350e4ghsaWEB
- github.com/open-webui/open-webui/pull/23454ghsaWEB
- github.com/open-webui/open-webui/releases/tag/v0.9.0ghsaWEB
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