CVE-2026-8844

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.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.

References

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

CWEs

CWE-79

💬 Discuss CVE-2026-8844 on VIR Community →

Community-verified mitigations for this CVE will appear above when contributors publish them.