# CVE-2026-4131

> Vulnerability · severity: **MEDIUM** (CVSS 6.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-4131
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.1
- **CWE codes:** CWE-352

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4131

## Citation

> AI Analytics. CVE-2026-4131. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-4131. Derived from NIST NVD. Licensed CC0.

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