CVE-2026-54020

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients resolved the hostname again at connection time. An authenticated attacker who controlled authoritative DNS for a submitted hostname could answer with a public address during validation and an internal one during connection, reaching cloud metadata, loopback admin APIs, or internal services through URL ingest, chat image_url fetches, image editing, or OAuth profile-picture fetches, with most paths returning the response to the attacker and the OAuth path forwarding the OAuth access token. This issue is fixed in 0.11.0.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/open-webui/open-webui/releases/tag/v0.11.0	Release Notes
https://github.com/open-webui/open-webui/security/advisories/GHSA-h6x2-583h-x99r	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*

History

18 Sep 2026, 14:58

Type	Values Removed	Values Added
References	~~() https://github.com/open-webui/open-webui/releases/tag/v0.11.0 -~~	() https://github.com/open-webui/open-webui/releases/tag/v0.11.0 - Release Notes
References	~~() https://github.com/open-webui/open-webui/security/advisories/GHSA-h6x2-583h-x99r -~~	() https://github.com/open-webui/open-webui/security/advisories/GHSA-h6x2-583h-x99r - Patch, Vendor Advisory
First Time		Openwebui Openwebui open Webui
CPE		cpe:2.3:a:openwebui:open_webui::::::::

Information

Published : 2026-08-04 21:16

Updated : 2026-09-18 14:58

NVD link : CVE-2026-54020

Mitre link : CVE-2026-54020

CVE.ORG link : CVE-2026-54020

JSON object : View

Products Affected

openwebui

open_webui

CWE

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-918

Server-Side Request Forgery (SSRF)

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