Vulnerability details

CVE-2026-70485

open-webui open-webui

Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs

CVSS 3.1

7.1High

Official description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, Open WebUI checked whether a user-supplied URL destination was globally routable by applying ipaddress.is_global to the literal IPv6 address without examining IPv4 addresses embedded in transition encodings. On a deployment with a NAT64 gateway, any verified user could wrap an internal or cloud-metadata IPv4 address in the NAT64 well-known prefix, pass the filter, and receive the internal response body through RAG URL ingestion, URL-to-markdown conversion, or web-search content retrieval. This issue is fixed in 0.11.0.

CVSS scores

Score	Version	Source	Vector
7.1High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N`

Affected products

Vendor	Product	Versions	Source
open-webui	open-webui	>= 0.9.0, < 0.11.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3 x_refsource_MISC
https://github.com/open-webui/open-webui/releases/tag/v0.11.0 x_refsource_MISC
https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp x_refsource_CONFIRM

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Details

Published: 2026-08-04
Last updated: 2026-08-05
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.35%

Probability of exploitation in 30 days

28.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-918
Server-Side Request Forgery (SSRF)