PT-2026-43510 · Kevin1804 · Responsive Check

Nail Majdeddine · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-8844

NVD

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-8844

Affected Products

Responsive Check

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-8844 · Security Note
• https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L54 · Note
• https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L14 · Note
• https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L25 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/d1d571e3-cf6d-4e9b-a3d7-e7e19497b5a9?source=cve · Note