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OpenAdvisories
Medium · 4.3 CVE-2026-59223 EUVD-2026-42633GHSA-qg3f-8x3j-ggf2PYSEC-2026-3603

Open WebUI: `WEB_FETCH_FILTER_LIST` host allow/block filter bypassable via URL path and non-label-boundary matching

Published Jul 9, 2026 · Updated Jul 9, 2026 · Assigned by GitHub_M

Description

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

VendorProductAffectedFixed
open-webui open-webui < 0.10.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI open-webui < 0.10.0 0.10.0 GHSA-qg3f-8x3j-ggf2

References