CVE-2026-109291

HIGH 7.3

Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

0th

Open WebUI from 0.6.33 before 0.11.4 contains a cross-site scripting vulnerability that allows authenticated users to execute script in victims' sessions by storing javascript: URLs in citation embed_url fields. Attackers can share a crafted chat whose citation, when clicked, is passed to window.open, letting them steal localStorage.token and act as the victim.

CWE	CWE-79
Vendor	open-webui
Product	open-webui
Published	Oct 12, 2026

Stay Ahead of the Next One

Get instant alerts for open-webui open-webui

Be the first to know when new high vulnerabilities affecting open-webui open-webui are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

open-webui / open-webui

0.6.33 < 0.11.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/open-webui/open-webui/security/advisories/GHSA-qpqv-xwg8-cqpj vulncheck.com: https://www.vulncheck.com/advisories/open-webui-0.6.33-before-0.11.4-stored-xss-via-citation-embed-url

Credits

🔍 zyakir13 Classic298