Stored Cross-Site Scripting in Popup Builder Plugin for WordPress
CVE-2025-9856

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Popup Builder – Create Highly Converting, Mobile Friendly Marketing Popups.
Vendor
CVE Published:
13 December 2025

What is CVE-2025-9856?

The Popup Builder plugin for WordPress is susceptible to a Stored Cross-Site Scripting vulnerability via its 'sg_popup' shortcode across all versions up to 4.4.1. This flaw arises from inadequate sanitization of user input and failing to properly escape output. Consequently, authenticated attackers with contributor-level access can inject malicious scripts into pages. These scripts will execute whenever users visit the compromised page, potentially leading to unauthorized actions and data exposure.

Affected Version(s)

Popup Builder – Create highly converting, mobile friendly marketing popups. * <= 4.4.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/popup-builder/...
https://plugins.trac.wordpress.org/browser/popup-builder/...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Naoya Takahashi
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CVE-2025-9856 : Stored Cross-Site Scripting in Popup Builder Plugin for WordPress