CVE-2026-45316: Openwebui Open Webui

Low severity, CVSS 3.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3.

Affected products

• Openwebui Open Webui: before 0.9.3 (fixed in 0.9.3)

Published 2026-05-15. Last modified 2026-06-17.