CVE-2026-8844
Responsive Check <= 0.0.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | kevin1804 |
| Product | responsive check |
| Published | May 27, 2026 |
| Last Updated | May 27, 2026 |
Stay Ahead of the Next One
Get instant alerts for kevin1804 responsive check
Be the first to know when new medium vulnerabilities affecting kevin1804 responsive check are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
kevin1804 / Responsive Check
0 ≤ 0.0.3
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/d1d571e3-cf6d-4e9b-a3d7-e7e19497b5a9?source=cve 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#L14 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/responsive-checker-real-time/trunk/responsive-check.php#L54
Credits
nail majdeddine