Popup Builder - Create highly converting, mobile friendly marketing popups. <= 4.4.2 - Improper Authorization to Unauthenticated Subscriber Removal via Predictable Tokens

Use of Predictable Algorithm in Random Number Generator
CVE CVE-2025-13079
CVSS Medium (5.3)
Publicly Published February 18, 2026
Last Updated February 19, 2026
Researcher Rafshanzani Suhada
Description

The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.4.2. This is due to the plugin generating predictable unsubscribe tokens using deterministic data. This makes it possible for unauthenticated attackers to unsubscribe arbitrary subscribers from mailing lists via brute-forcing the unsubscribe token, granted they know the victim's email address

References

1 affected software package

Software Type Plugin
Software Slug popup-builder (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 4.4.2
Patched Version
  • 4.4.3
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