gcdRadar
archive/Patch now/AIR-2026-0314
closedclosed 12 Oct 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-109288: Open WebUI stored XSS vulnerability allows JWT theft

Open WebUI

Open WebUI before version 0.11.4 contains a stored cross-site scripting vulnerability in markdown link rendering. Authenticated users can embed malicious links in shared chats to steal victim and administrator JWT tokens from local storage.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
7.2
EPSS
<0.01 · top 78% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
12 Oct 2026
last update
12 Oct 2026
CVE ids
CVE-2026-109288other records

Timeline · 1

  1. 12 Oct 2026CVE-2026-109288: Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders…

Sources · 1

Advisories and databases

  1. 2026-10-12
    CVE-2026-109288: Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-109288

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
xssjwt-theft
dates
happened 12 Oct 2026 · first reported 12 Oct 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 06:33Z · updated 2026-10-18 06:33Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-109288: Open WebUI stored XSS vulnerability allows JWT theft

https://gcdradar.vercel.app/incidents/cve-2026-109288-open-webui-stored-xss-vulnerability-allows-j · AIR-2026-0314 · closed 2026-10-12

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-12
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-109288
- CVSS: 7.2

## Summary

Open WebUI before version 0.11.4 contains a stored cross-site scripting vulnerability in markdown link rendering. Authenticated users can embed malicious links in shared chats to steal victim and administrator JWT tokens from local storage.

## What to do

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

## Latest updates

- 2026-10-12: CVE-2026-109288: Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders… (https://nvd.nist.gov/vuln/detail/CVE-2026-109288)

## Sources

- 2026-10-12 NVD: CVE-2026-109288: Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders… https://nvd.nist.gov/vuln/detail/CVE-2026-109288

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

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