Is this vulnerability remotely exploitable across users?

Yes. Once a malicious `embeds` payload is stored in a chat, any user who opens that chat or a shared version of it in their browser can trigger the stored XSS without additional interaction if the payload is designed to execute on load.

What level of access does an attacker need to exploit this?

The attacker must be able to manually modify chat history so that they can set the `embeds` property of a response message. In practice, this may involve access to local storage, backend data stores, or administrative interfaces that allow editing of stored chat content.

What is the safest general fix pattern for developers?

Ensure that user-controlled embed data is never rendered in a same-origin frame that allows scripts. Either fully sanitize and constrain `embeds` to inert content, or isolate their rendering in a locked-down, script-disabled or cross-origin iframe, and consistently apply configuration that limits iframe capabilities.

Severity:

HIGH RISK

(7.3)

Stored Cross-Site Scripting (CWE-79) via iFrame Embeds in Open WebUI Chat History

CVE-2026-26193

Published:

Feb 19, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Stored Cross-Site Scripting in Web UI

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Stored Cross-Site Scripting in Web UI

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Stored Cross-Site Scripting (CWE-79) via iFrame Embeds in Open WebUI Chat History

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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