CVE-2026-59218: Openwebui Open Webui

Medium severity, CVSS 5.3. 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, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than missing-email attempts and allowing unauthenticated account enumeration. 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.