CVE-2024-3494Network attack vector

Stored XSS via unescaped shortcode attributes

Published May 8, 2024 · Updated Apr 8, 2026

Stored XSS in Extend Themes Mesmerize Companion 1.6.148 and earlier allows remote authenticated users to inject scripts via shortcode attributes. The mesmerize_contact_form handler accepts contributor-controlled shortcode attributes without sufficient sanitization or output escaping before page rendering. Contributor-level access is required; the injected JavaScript runs in visitors' browsers when the affected page is opened, enabling page-data access or content changes in that session.

CVSS severity6.4
Medium
EPSS probability0.33%
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 Extend Themes Mesmerize Companion 1.6.148 and earlier allows remote authenticated users to inject scripts via shortcode attributes. The mesmerize_contact_form handler accepts contributor-controlled shortcode attributes without sufficient sanitization or output escaping before page rendering. Contributor-level access is required; the injected JavaScript runs in visitors' browsers when the affected page is opened, enabling page-data access or content changes in that session.

The record

CVE
CVE-2024-3494
Published
May 8, 2024
Updated
Apr 8, 2026
Vendor
Extend Themes
Product
Mesmerize Companion
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=1.6.148

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Extend Themes · Mesmerize Companionversion=0 <=1.6.148

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/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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