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Vulnerability record · CVE-2024-4045 · published 25 May 2024

CVE-2024-4045: Optinmonster cross-site scripting vulnerability

Optinmonster · Optinmonster

The Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘campaign_id’ parameter in versions up to, and including, 2.16.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

5.4 CVSS 3.1 Medium EPSS 0.32% · top 77.3% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
0.32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

The Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘campaign_id’ parameter in versions up to, and including, 2.16.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://plugins.trac.wordpress.org/browser/optinmonster/tags/2.16.0/OMAPI/Elementor/Widget.php#L532 Product
https://plugins.trac.wordpress.org/changeset/3087905/ Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/b4dfeb49-38d3-495d-af96-d67a29b339fa?source=cve Third Party Advisory
https://plugins.trac.wordpress.org/browser/optinmonster/tags/2.16.0/OMAPI/Elementor/Widget.php#L532 Product
https://plugins.trac.wordpress.org/changeset/3087905/ Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/b4dfeb49-38d3-495d-af96-d67a29b339fa?source=cve Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-4045), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.