CVE-2026-26193: Open WebUI stored XSS via iFrame embed properties

# CVE-2026-26193: Open WebUI stored XSS via iFrame embed properties

https://gcdradar.vercel.app/incidents/cve-2026-26193-open-webui-stored-xss-via-iframe-embed-proper · AIR-2026-0797 · closed 2026-02-19

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-02-19 (happened 2026-07-07)
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-26193
- CVSS: 7.3

## Summary

Modified chat history allows setting embed properties in Open WebUI responses that load into sandboxed iFrames with overly permissive settings. This enables stored XSS via shareable chat links.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-07-07: CVE-2026-26193: Open WebUI vulnerable to Stored XSS via iFrame embeds in response messages (https://github.com/advisories/GHSA-vjm7-m4xh-7wrc)
- 2026-02-19: CVE-2026-26193: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-26193)

## Sources

- 2026-02-19 NVD: CVE-2026-26193: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-26193
- 2026-07-07 GitHub Advisory Database: CVE-2026-26193: Open WebUI vulnerable to Stored XSS via iFrame embeds in response messages https://github.com/advisories/GHSA-vjm7-m4xh-7wrc

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.