CVE-2026-59223: Openwebui Open Webui

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, WEB_FETCH_FILTER_LIST matching compared configured host entries against URL strings and non-label-boundary suffixes, allowing path-based blocklist bypasses such as !internal.example.com in a URL path and sibling-domain matches that did not reflect the intended hostname policy. This issue is fixed in version 0.10.0.

Affected products

• Openwebui Open Webui: before 0.10.0 (fixed in 0.10.0)

Published 2026-07-09. Last modified 2026-07-10.