CVE-2025-13079 Auth bypass in Popup Builder – Create highly converting, mobile friendly marketing popups.
Unauthenticated attackers can unsubscribe arbitrary subscribers from mailing lists by brute-forcing predictable unsubscribe tokens.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-13079?
CVE-2025-13079 is a medium-severity authentication bypass vulnerability in popupbuilder Popup Builder – Create highly converting, mobile friendly marketing popups., published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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
Weakness: CWE-1241
Which versions are affected by CVE-2025-13079?
How do I fix CVE-2025-13079?
No fix has been published for CVE-2025-13079 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-13079 being exploited?
There is no known exploitation of CVE-2025-13079 in the wild and no public exploit code.
Sources
Also known as GHSA-fqr3-6hfc-hrf6.