CVE-2026-45386: Openwebui Open Webui

Medium severity, CVSS 4.3. 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 0.9.5, Pin/Unpin is a write operation (modifies the message's is_pinned , pinned_by, pinned_at fields), but in standard channels it only checks read permission, allowing users with read-only access to pin/unpin any message. This vulnerability is fixed in 0.9.5.

Affected products

• Openwebui Open Webui: before 0.9.5 (fixed in 0.9.5)

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