Vulnerability in Openwebui Open Webui
CVE-2025-63681
open-webui v0.6.33 is vulnerable to Incorrect Access Control. The API /api/tasks/stop/ directly accesses and cancels tasks without verifying user ownership, enabling attackers (a normal user) to stop arbitrary LLM response tasks.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Openwebui Open Webui — versions 0.6.41
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/… (Product)
- github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-63681?
- CVE-2025-63681 is a medium-severity vulnerability in Openwebui Open Webui, classified under Improper Access Control. CVSS score: 4.3/10. Published 2025-12-04.
- How severe is CVE-2025-63681?
- Medium severity. CVSS v3 base score is 4.3 out of 10.