Vulnerabilities and security researches forresponsive-checker-real-time responsive-checker-real-time

May 28, 2026

CVE, Research URL: CVE-2026-8844
Home page URL: Security reports for Responsive Check
Application: Responsive Check
Date: May 27, 2026
Research Description: The Responsive Check plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'rspcheck' shortcode in versions up to, and including, 0.0.3. This is due to insufficient input sanitization and output escaping on the 'url' (and 'button') shortcode attributes in the rspc_check_shortcode() function, which are echoed directly into iframe src attributes without esc_attr() or esc_url(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Affected versions: max 0.0.3.
Status: vulnerable