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CVE-2026-109291

7.3, high

open-webui Cross-Site Scripting Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.3, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 19% of scored CVEs
Exploitation
No public evidence
Published
12 Oct 20265 days ago

Description

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.

Details

Vendor
Open-webui
Product
open-webui
Weakness
CWE-79 (opens in a new tab)
Status
Awaiting analysis
Updated
15 Oct 2026
Assigner
disclosure@vulncheck.com

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Open-webui CVEs

Every Open-webui CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-109286 Open WebUI from 0.7.0 before 0.11.4 contains a cross-origin message handling vulnerability in SyncStatsModal that allows any website to… EPSS 0.1% 8.1, high
  • CVE-2026-109290 open-webui Cross-Site Scripting Vulnerability EPSS 0.3% 7.3, high
  • CVE-2026-109572 open-webui Missing Authorization Vulnerability EPSS 0.3% 7.6, high

Beyond this page

Is CVE-2026-109291 in your network?

This page tells you how dangerous CVE-2026-109291 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-109291 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.