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CVE-2026-8844

MEDIUM 6.4 CVSS 3.1
Published
May 27, 2026
Last modified
June 17, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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 WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • kevin1804 Responsive Check — Up to and including 0.0.3

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L14
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L25
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L54
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/d1d571e3-cf6d-4e9b-a3d7-e7e19497b5a9?source=cve
  • nvd.nist.gov Official NVD record