CVE-2026-109989
Received Received - Intake

Stored XSS in Themify Popup WordPress Plugin

Publication date: 2026-10-17

Last updated on: 2026-10-17

Assigner: Wordfence

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-17
Last Modified
2026-10-17
Generated
2026-10-17
AI Q&A
2026-10-17
EPSS Evaluated
N/A
NVD
CVE-2026-109989
EUVD
EUVD-2026-103231

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
themifyme Themify Popup 0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

The Themify Popup plugin for WordPress has a stored Cross-Site Scripting (XSS) vulnerability in versions up to 1.4.7. The issue is due to insufficient input sanitization and output escaping in the 'popup_width_unit' parameter. Authenticated attackers with author-level access or higher can inject malicious scripts into pages. These scripts execute when users access the affected pages.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Themify Popup plugin version 1.4.7 or lower. Check for unauthorized scripts in pages or posts, particularly those with injected popup_width_unit parameters. Review server logs for unusual activity from authenticated users with author-level access or higher.

Impact Analysis

If exploited, this vulnerability allows attackers to inject malicious scripts into your WordPress site. These scripts can steal user data, hijack sessions, or perform actions on behalf of users. Since it requires author-level access, the risk is higher for sites with multiple contributors.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR and HIPAA compliance. GDPR requires protecting user data, and HIPAA mandates safeguarding protected health information. Exploitation may result in data breaches, leading to legal penalties and reputational damage.

Mitigation Strategies
  • Update the Themify Popup plugin to the latest version immediately to patch the vulnerability.
  • Remove any suspicious scripts or code snippets from pages or posts that may have been injected.
  • Restrict author-level and higher user roles to only trusted personnel to reduce attack surface.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-109989. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart