CVE-2026-26192

Received Received - Intake

Stored XSS in Open WebUI Chat Metadata Allows Remote Code Execution

Publication date: 2026-02-19

Last updated on: 2026-02-20

Assigner: GitHub, Inc.

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.7.0, aanually modifying chat history allows setting the `html` property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponized document payload in a chat. The payload also executes when the citation is viewed on a shared chat. Version 0.7.0 fixes the issue.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-02-19

Last Modified

2026-02-20

Generated

2026-07-06

AI Q&A

2026-02-19

EPSS Evaluated

2026-07-05

NVD

CVE-2026-26192

EUVD

EUVD-2026-7982

Affected Vendors & Products

Vendor	Product	Version / Range
openwebui	open_webui	to 0.7.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Open WebUI to version 0.7.0 or later, as this version fixes the issue.

Executive Summary

This vulnerability exists in Open WebUI versions prior to 0.7.0. It occurs because manually modifying chat history allows an attacker to set the `html` property within document metadata. This causes the frontend to treat the document contents as HTML and render them inside an iFrame when the citation is previewed. As a result, a stored cross-site scripting (XSS) attack can be executed via a specially crafted document payload in a chat.

The malicious payload also executes when the citation is viewed on a shared chat, potentially affecting multiple users.

The issue was fixed in version 0.7.0 of Open WebUI.

Impact Analysis

This vulnerability can lead to stored cross-site scripting (XSS) attacks, which may allow an attacker to execute arbitrary code in the context of the victim's browser when they view the malicious citation.

Compromise of user data confidentiality and integrity.
Potential unauthorized actions performed on behalf of the user.
Exposure to further attacks such as session hijacking or phishing.

Since the payload executes when viewing shared chats, multiple users can be affected, increasing the scope of impact.

Compliance Impact

I don't know

Detection Guidance

I don't know

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