Authorization Bypass Vulnerability in Popup Builder Plugin for WordPress
CVE-2025-13079

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Popup Builder – Create Highly Converting, Mobile Friendly Marketing Popups.
Vendor
CVE Published:
19 February 2026

What is CVE-2025-13079?

The Popup Builder plugin for WordPress is susceptible to an authorization bypass vulnerability across all versions up to and including 4.4.2. This issue arises from the generation of predictable unsubscribe tokens derived from deterministic data. As a result, unauthenticated attackers can exploit this vulnerability by brute-forcing the unsubscribe tokens, allowing them to unsubscribe arbitrary email addresses from mailing lists if they know the victim's email. Users are advised to update to the latest version to mitigate this risk.

Affected Version(s)

Popup Builder – Create highly converting, mobile friendly marketing popups. 0 <= 4.4.2

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:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Rafshanzani Suhada
.