Medium severity · published Dec 4, 2025
CVE-2025-63681
open-webui v0.6.33 is vulnerable to Incorrect Access Control
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OW
Open Webui · Openwebui
0.6.41 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-63681
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-63681
Exploit
https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
Product
https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
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