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archive/Patch now/AIR-2026-1183
closedclosed 15 Jul 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-56398: Stored XSS vulnerability in Open WebUI OAuth flow

Open WebUI

Open WebUI before version 0.9.5 contains a stored cross-site scripting vulnerability during the OAuth authentication flow. The flaw enables script execution to steal tokens and achieve account takeover, though no active exploitation is confirmed.

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
8.5
EPSS
0.01 · top 49% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
15 Jul 2026
last update
15 Jul 2026
CVE ids
CVE-2026-56398other records

Timeline · 1

  1. 15 Jul 2026CVE-2026-56398: Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the picture…

Sources · 1

Advisories and databases

  1. 2026-07-15
    CVE-2026-56398: Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the picture…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-56398

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
xssaccount-takeover
dates
happened 15 Jul 2026 · first reported 15 Jul 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 10:04Z · updated 2026-10-18 10:04Z

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-2026-56398: Stored XSS vulnerability in Open WebUI OAuth flow

https://gcdradar.vercel.app/incidents/cve-2026-56398-stored-xss-vulnerability-in-open-webui-oauth · AIR-2026-1183 · closed 2026-07-15

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-07-15
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-56398
- CVSS: 8.5

## Summary

Open WebUI before version 0.9.5 contains a stored cross-site scripting vulnerability during the OAuth authentication flow. The flaw enables script execution to steal tokens and achieve account takeover, though no active exploitation is confirmed.

## What to do

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

## Latest updates

- 2026-07-15: CVE-2026-56398: Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the picture… (https://nvd.nist.gov/vuln/detail/CVE-2026-56398)

## Sources

- 2026-07-15 NVD: CVE-2026-56398: Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the picture… https://nvd.nist.gov/vuln/detail/CVE-2026-56398

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

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