Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openwebui | Open Webui | < 0.9.0 |
Related Weaknesses (CWE)
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22ExploitMitigationVendor Advisory
- https://github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-45399?
CVE-2026-45399 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 acro...
How severe is CVE-2026-45399?
CVE-2026-45399 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45399?
Check the references section above for vendor advisories and patch information. Affected products include: Openwebui Open Webui.