CVE-2025-63681 open-webui is Vulnerable to Incorrect Access Control
Attackers can stop arbitrary LLM response tasks by accessing an API endpoint without ownership verification, causing service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-63681?
CVE-2025-63681 is a medium-severity missing authorization vulnerability in Openwebui Open Webui, published on 4 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2025-63681?
3 open source packages ship an affected version, including open-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
open-webui PyPI | All versions to 0.6.33 | None |
open-webui PyPI | All versions to 0.6.33 | None |
open-webui PyPI | All versions | 0.9.0 |
Products include Openwebui Open Webui.
How do I fix CVE-2025-63681?
Upgrade open-webui to 0.9.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-63681 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-63681 exists.
Other vulnerabilities in Openwebui Open Webui
- CVE-2026-44551 Open WebUI: LDAP Empty Password Authentication Bypass
- CVE-2026-56400 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
- CVE-2024-8017 Cross-site Scripting (XSS) in open-webui/open-webui
- CVE-2026-45672 Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
- CVE-2026-87995 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Sources
Also known as GHSA-frv8-gffc-37px, PYSEC-2026-1732.