What’s Vulnerable › Vulnerabilities

CVE-2026-26192: Open WebUI vulnerable to Stored XSS via iFrame in citations model

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-19 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• open-webui: before 0.7.0 — fixed in 0.7.0

How to fix

Upgrade to a fixed version: open-webui 0.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/Citations/CitationModal.svelte#L163-L170
• https://github.com/open-webui/open-webui/security/advisories/GHSA-xc8p-9rr6-97r2

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