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
- www.wordfence.com/threat-intel/vulnerabilities/id/979962e3-9052-4dc9-94d0-3ec8d…
- plugins.trac.wordpress.org/browser/instant-popup-builder/trunk/public/class-ins…
- plugins.trac.wordpress.org/browser/instant-popup-builder/tags/1.1.6/public/clas…
- plugins.trac.wordpress.org/browser/instant-popup-builder/trunk/public/class-ins…
- plugins.trac.wordpress.org/browser/instant-popup-builder/tags/1.1.6/public/clas…
- plugins.trac.wordpress.org/changeset
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.