CVE-2026-45399
HIGHOpen WebUI: Low-privilege authenticated users can enumerate and stop global background tasks, causing system-wide chat disruption
Title source: cnaDescription
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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22
Scores
CVSS v3
7.1
EPSS
0.0004
EPSS Percentile
13.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-862
Status
published
Products (3)
open-webui/open-webui
< 0.9.0
openwebui/open_webui
< 0.9.0
pypi/open-webui
0 - 0.9.0PyPI
Published
May 15, 2026
Tracked Since
May 16, 2026