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

Weakness classification (CWE)

References

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.