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Vulnerability record · CVE-2026-87915 · published 18 September 2026

CVE-2026-87915: Cross-site scripting vulnerability

The Popup Maker – Boost Sales, Conversions, Optins, Subscribers with the Ultimate WP Popup Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via values[Name] Parameter in all versions up to, and including, 1.24.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The wp_kses sanitization applied on output is insufficient in this context because HTML entities within allowed attribute values survive normalization intact and are later evaluated by the jQuery(link.attr('href')) sink in wp-admin/js/common.js when a contextual help tab anchor is clicked.

7.2 CVSS 3.1 High EPSS 0.49% · top 60.0% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
18 Sep 2026Last modified by NVD

Description

The Popup Maker – Boost Sales, Conversions, Optins, Subscribers with the Ultimate WP Popup Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via values[Name] Parameter in all versions up to, and including, 1.24.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The wp_kses sanitization applied on output is insufficient in this context because HTML entities within allowed attribute values survive normalization intact and are later evaluated by the jQuery(link.attr('href')) sink in wp-admin/js/common.js when a contextual help tab anchor is clicked.

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

References

LinkTags
https://plugins.trac.wordpress.org/browser/popup-maker/tags/1.24.0/classes/Abstract/Database.php#L359
https://plugins.trac.wordpress.org/browser/popup-maker/tags/1.24.0/classes/Admin/Subscribers/Table.php#L281
https://plugins.trac.wordpress.org/browser/popup-maker/tags/1.24.0/classes/ListTable.php#L1408
https://plugins.trac.wordpress.org/browser/popup-maker/tags/1.24.0/classes/Newsletters.php#L273
https://plugins.trac.wordpress.org/browser/popup-maker/tags/1.24.0/classes/Newsletters.php#L59
https://plugins.trac.wordpress.org/browser/popup-maker/tags/1.24.0/classes/Newsletters.php#L74
https://plugins.trac.wordpress.org/changeset/3690634/popup-maker/trunk/classes/Admin/Subscribers/Table.php
https://plugins.trac.wordpress.org/changeset?reponame=&new=3690634%40popup-maker%2Ftags%2F1.25.0&old=3648112%40popup-mak
https://www.wordfence.com/threat-intel/vulnerabilities/id/ea8b1eee-2e3f-4d61-b815-4ea0aaa188b5?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-87915), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.