CVE-2026-109291CWE-79cross-site-scripting

CVE-2026-109291

High · published October 12, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
19.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
8.5 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00279 · 19.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-12T21:17Z
References (2)
https://github.com/open-webui/open-webui/security/advisories/GHSA-qpqv-xwg8-cqpj · [email protected]https://www.vulncheck.com/advisories/open-webui-0.6.33-before-0.11.4-stored-xss-via-citation-embed-url · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url
    cvelistv5