CVE-2025-13079
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Authorization Bypass in Popup Builder Plugin Enables Subscriber Unsubscription

Publication date: 2026-02-19

Last updated on: 2026-02-19

Assigner: Wordfence

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
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Meta Information
Published
2026-02-19
Last Modified
2026-02-19
Generated
2026-06-16
AI Q&A
2026-02-19
EPSS Evaluated
2026-06-14
NVD
CVE-2025-13079
EUVD
EUVD-2025-207887
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
popup_builder popup_builder to 4.4.2 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1241 The device uses an algorithm that is predictable and generates a pseudo-random number.
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Executive Summary

The vulnerability exists in the Popup Builder plugin for WordPress, versions up to and including 4.4.2. It is an authorization bypass issue caused by the plugin generating predictable unsubscribe tokens using deterministic data.

Because the unsubscribe tokens are predictable, an unauthenticated attacker who knows a victim's email address can brute-force these tokens to unsubscribe arbitrary subscribers from mailing lists.

Impact Analysis

This vulnerability allows attackers to unsubscribe users from mailing lists without their consent.

While it does not allow data theft or direct system compromise, it can disrupt communication by removing subscribers from marketing or notification lists.

This could lead to loss of engagement with users or customers and potentially impact marketing efforts.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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