Auth bypass in Instantpopupbuilder Instant Popup Builder – Powerful Maker For Opt-ins, Email Newsletters & Lead Generation

CVE-2026-3475

The Instant Popup Builder plugin for WordPress is vulnerable to Unauthenticated Arbitrary Shortcode Execution in all versions up to and including 1.1.7. This is due to the handle_email_verification_page() function constructing a shortcode…

Vulnerability class: Broken Access Control

EPSS: 0.001 (25.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-3475?
CVE-2026-3475 is a medium-severity vulnerability in Instantpopupbuilder Instant Popup Builder – Powerful Maker For Opt-ins, Email Newsletters & Lead Generation, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-03-19.
How severe is CVE-2026-3475?
Medium severity. CVSS v3 base score is 5.3 out of 10.