CVE-2026-26193

HIGH

Open WebUI < 0.6.44 - Stored Cross-Site Scripting via Chat History Embeds Property

Title source: llm

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.6.44, aanually modifying chat history allows setting the `embeds` property on a response message, the content of which is loaded into an iFrame with a sandbox that has `allow-scripts` and `allow-same-origin` set, ignoring the "iframe Sandbox Allow Same Origin" configuration. This enables stored XSS on the affected chat. This also triggers when the chat is in the shared format. The result is a shareable link containing the payload that can be distributed to any other users on the instance. Version 0.6.44 fixes the issue.

References (2)

Core 2

Core References

Vendor Advisory x_refsource_confirm

https://github.com/open-webui/open-webui/security/advisories/GHSA-vjm7-m4xh-7wrc

Various Sources x_refsource_misc

https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/ResponseMessage.svelte#L689-L703

View Writeup ZIP pw:eip

Scores

CVSS v3 7.3

EPSS 0.0004

EPSS Percentile 13.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-79

Status published

Products (1)

openwebui/open_webui < 0.6.44

Published Feb 19, 2026

Tracked Since Feb 19, 2026