---
id: CVE-2026-109989
title: >-
  Themify Popup <= 1.4.7 - Authenticated (Author+) Stored Cross-Site Scripting
  via 'popup_width_unit' Parameter
summary: >-
  The Themify Popup plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via the 'popup_width_unit' parameter in all versions up to, and
  including, 1.4.7 due to insufficient input sanitization and output escaping.
  This makes i…
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'
cvssSource: cna
cwe:
  - CWE-79
vendor: themifyme
product: Themify Popup
affected:
  - themify_popup <= 1.4.7
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T03:43:30.393Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109989'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/da003985-7fb2-4f5b-bb70-6ec3578ef3e8?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/themify-popup/tags/1.4.7/views/styles.php#L29
  - url: >-
      https://plugins.trac.wordpress.org/browser/themify-popup/tags/1.4.7/includes/themify-metabox/includes/themify-metabox-core.php#L209
  - url: >-
      https://plugins.trac.wordpress.org/browser/themify-popup/tags/1.4.7/includes/themify-metabox/includes/themify-metabox-core.php#L151
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3749602%40themify-popup&new=3749602%40themify-popup
tags:
  - cve.org
ingestedAt: '2026-10-17T03:58:44.708Z'
epss: 0.00193
epssPercentile: 0.08392
---

## Overview

The Themify Popup plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'popup_width_unit' parameter in all versions up to, and including, 1.4.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## Affected

- `themify_popup <= 1.4.7`

## Remediation

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