---
id: CVE-2025-9856
title: 'The Popup Builder – Create highly converting, mobile friendly marketing popups'
summary: >-
  The Popup Builder – Create highly converting, mobile friendly marketing
  popups. plugin for WordPress is vulnerable to Stored Cross-Site Scripting via
  the plugin's 'sg_popup' shortcode in all versions up to, and including, 4.4.1
  due to in…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2025-12-13'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T19:10:00.160'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9856'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.0/com/classes/popups/SGPopup.php#L1368
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.0/com/helpers/AdminHelper.php#L438
    label: security@wordfence.com
  - url: 'https://plugins.trac.wordpress.org/changeset/3384281'
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/beb6b26a-3fe1-44e0-9fda-97b288abf735?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00299
epssPercentile: 0.20638
ingestedAt: '2026-10-07T19:44:15.659Z'
---

## Overview

The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'sg_popup' shortcode in all versions up to, and including, 4.4.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.