CVE-2025-63681: open-webui is Vulnerable to Incorrect Access Control

December 4, 2025 (updated December 5, 2025)

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.

References

github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
github.com/advisories/GHSA-frv8-gffc-37px
github.com/open-webui/open-webui
github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py
nvd.nist.gov/vuln/detail/CVE-2025-63681

Code Behaviors & Features

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