CSRF in Sphex1987 Wp Responsive Popup + Optin
CVE-2026-4131
The WP Responsive Popup + Optin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.4. This is due to the settings form on the admin page (wpo_admin_page.php) lacking nonce generation (wp_…
Vulnerability class: CSRF (Cross-Site Request Forgery)
EPSS: 0.000 (1.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Sphex1987 Wp Responsive Popup + Optin — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/0a8a49c4-21e8-447c-94da-8241c…
- plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wp-popup-optin.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wp-popup-optin.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php
- plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php
Frequently asked questions
- What is CVE-2026-4131?
- CVE-2026-4131 is a medium-severity vulnerability in Sphex1987 Wp Responsive Popup + Optin, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.1/10. Published 2026-04-22.
- How severe is CVE-2026-4131?
- Medium severity. CVSS v3 base score is 6.1 out of 10.