Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M
CVE-2026-59223Open WebUI: `WEB_FETCH_FILTER_LIST` host allow/block filter bypassable via URL path and non-label-boundary matching
Medium 4.3
In plain English
A medium-severity security flaw in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | open-webui | 0.10.0 | GHSA-qg3f-8x3j-ggf2 |
| PyPI | open-webui | 0.10.0 | PYSEC-2026-3603 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | < 0.10.0 |
Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-qg3f-8x3j-ggf2 x_refsource_CONFIRM
- https://github.com/open-webui/open-webui/pull/25949 x_refsource_MISC
- https://github.com/open-webui/open-webui/commit/087878ce848a4d828012068b5997dac480f43656 x_refsource_MISC
- https://github.com/open-webui/open-webui/releases/tag/v0.10.0 x_refsource_MISC