Auth bypass in Popupbuilder Popup Builder – Create Highly Converting, Mobile Friendly Marketing Popups.

CVE-2026-89270

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, 4.4.5 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to trash all published popups on the site with a single unauthenticated GET request. The attack is amplified by a second flaw in SGPopup::find(), which returns false for every normally published popup when the sg_popup_preview_id parameter is present, causing the trash branch to fire against every popup on the site simultaneously.

Vulnerability class: Broken Access Control

Published .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-89270?
CVE-2026-89270 is a critical-severity vulnerability in Popupbuilder Popup Builder – Create Highly Converting, Mobile Friendly Marketing Popups., classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-10-31.
How severe is CVE-2026-89270?
Critical severity. CVSS v3 base score is 9.1 out of 10.