CVE-2025-13079

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

2026-02-18 00:00

Strategic Overview

Status: Patched in 4.4.3
Affected Plugin: Popup Builder – Create highly converting, mobile friendly marketing popups.
Affected Version: <= 4.4.2
CVSS: 5.3Medium
Weakness type: CWE-1241 · Use of Predictable Algorithm in Random Number Generator
CVE: CVE-2025-13079

View all Popup Builder – Create highly converting, mobile friendly marketing popups. vulnerabilities

At a glance

CVE-2025-13079 is a medium-severity Use of Predictable Algorithm in Random Number Generator vulnerability in the Popup Builder WordPress plugin, affecting versions <= 4.4.2. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 4.4.3; sites on affected versions should update now. Disclosed February 2026, reported by Rafshanzani Suhada.

Vulnerability Overview

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

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-1241: Use of Predictable Algorithm in Random Number Generator

The device uses an algorithm that is predictable and generates a pseudo-random number.

Remediation

Update to version 4.4.3, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Popup Builder 4.4.3 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2025-13079 https://www.wordfence.com/threat-intel/vulnerabilities/id/62b29721-0580-4e1d-824d-9b8355890248 https://nvd.nist.gov/vuln/detail/CVE-2025-13079

Related records

Other vulnerabilities in Popup Builder – Create highly converting, mobile friendly marketing popups.

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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