CVE-2025-9856: Popupbuilder Popup Builder – Create Highly Converting, Mobile Friendly Marketing Popups

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Popupbuilder Popup Builder – Create Highly Converting, Mobile Friendly Marketing Popups: up to and including 4.4.1

Published 2025-12-13. Last modified 2026-10-07.