Open WebUI up to 0.11.0 Knowledge Base knowledge.py improper authorization

Summaryinfo

A vulnerability described as problematic has been identified in Open WebUI up to 0.11.0. This vulnerability affects unknown code of the file backend/open_webui/routers/knowledge.py of the component Knowledge Base. The manipulation results in improper authorization. This vulnerability is known as CVE-2026-87998. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Open WebUI up to 0.11.0. It has been classified as problematic. Affected is an unknown code block of the file backend/open_webui/routers/knowledge.py of the component Knowledge Base. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on integrity, and availability. CVE summarizes:

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base but then removed its administrator-owned external connection without a separate administrator check or a check for other dependent knowledge bases. A non-administrator with write access to one external knowledge base could delete shared instance configuration and make every other knowledge base using that connection unavailable. This issue is fixed in version 0.11.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-87998 since 09/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 0.11.1 eliminates this vulnerability.

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Productinfo

Name

• Open WebUI

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11.0

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CPE 2.2info

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