CVE-2026-18404Network attack vector

Stored script execution via unescaped consent message

Published Sep 5, 2026 · Updated Sep 7, 2026

Stored XSS in QuadLayers Social Chat – Click To Chat App Button 8.6.2 and earlier allows remote authenticated users to execute scripts. The .qlwapp data-box serializes an insufficiently sanitized consent_message value into JSON that frontend code renders without output escaping. Contributor-level access is required to set the attribute; when auto_open and consent_enabled are yes, the consent box runs the script on page load.

CVSS severity6.4
Medium
EPSS probability0.20%
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 QuadLayers Social Chat – Click To Chat App Button 8.6.2 and earlier allows remote authenticated users to execute scripts. The .qlwapp data-box serializes an insufficiently sanitized consent_message value into JSON that frontend code renders without output escaping. Contributor-level access is required to set the attribute; when auto_open and consent_enabled are yes, the consent box runs the script on page load.

The record

CVE
CVE-2026-18404
Published
Sep 5, 2026
Updated
Sep 7, 2026
Vendor
Roman Pronskiy
Product
Social Chat – Click To Chat App Button
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 7, 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 <=8.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Roman Pronskiy · Social Chat – Click To Chat App Buttonversion=0 <=8.6.2

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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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