CVE-2026-109288

Medium

Description

Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.

SeverityMedium

CVSS6.4

Exploit probability—

ProductOpen-webui

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

open-webui open-webui0.11.4 or later

Vendor advisories

github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6

Affected products

Product	Affected versions	Fixed in
open-webui open-webui	v < 0.11.4	0.11.4

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