What’s Vulnerable › Vulnerabilities

CVE-2026-4131: WP Responsive Popup + Optin <= 1.4 - Cross-Site Request Forgery to Stored Cross-Site Scripting via 'wpo_image_url' Parameter

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-06-17
• Weakness: CWE-352

Description

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_nonce_field) and verification (wp_verify_nonce/check_admin_referer). This makes it possible for unauthenticated attackers to update all plugin settings including the 'wpo_image_url' parameter via a forged request, granted they can trick a site administrator into performing an action such as clicking a link.

Affected products

• sphex1987 WP Responsive Popup + Optin: through 1.4

References

• https://plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wp-popup-optin.php#L218
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L103
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L104
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L15
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L43
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wp-popup-optin.php#L218
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php#L103
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php#L104
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php#L15
• https://plugins.trac.wordpress.org/browser/wp-popup-optin/trunk/wpo_admin_page.php#L43
• https://www.wordfence.com/threat-intel/vulnerabilities/id/0a8a49c4-21e8-447c-94da-8241c7d66c29?source=cve

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