CVE-2026-26193Public exploitNetwork attack vector

Stored XSS via permissive response-message iframe sandbox

Published Feb 19, 2026 · Updated Feb 19, 2026

Stored XSS in response-message embeds in Open WebUI before 0.6.44 allows remote authenticated users to execute script via a shared chat. ResponseMessage.svelte passes user-controlled message.embeds values to FullHeightIframe while hardcoding allowScripts and allowSameOrigin as true, defeating the configured sandbox boundary. An authenticated attacker must alter a chat history and persuade another user to open the chat or its shared link, enabling session-token theft and account takeover.

CVSS severity7.3
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in response-message embeds in Open WebUI before 0.6.44 allows remote authenticated users to execute script via a shared chat. ResponseMessage.svelte passes user-controlled message.embeds values to FullHeightIframe while hardcoding allowScripts and allowSameOrigin as true, defeating the configured sandbox boundary. An authenticated attacker must alter a chat history and persuade another user to open the chat or its shared link, enabling session-token theft and account takeover.

The record

CVE
CVE-2026-26193
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-79, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.6.44

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.6.44

Published CVSS scores

7.3GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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