Detections
Analytics
CVE-2026-19985
medium
Description
The Relevanssi – A Better Search plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 4.28.1 via the 's', 'post_types', and 'orderby' request parameters. This is due to insufficient input sanitization and output escaping in the relevanssi_debug_array() function in lib/debug.php, which dumps user-supplied query variables through print_r() inside a <pre> block without HTML escaping. The debug path is enabled by supplying the relevanssi_debug=on request parameter when the administrator has previously enabled the 'Debugging mode' setting; the gate itself is a configuration check with no capability, nonce, or logged-in check (the vendor explicitly suppresses nonce verification on that line). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.
References
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.1/lib/search.php#L562
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.1/lib/search.php#L143
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.1/lib/search.php#L132
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.1/lib/debug.php#L68
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.1/lib/debug.php#L27
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.27.2/lib/search.php#L562
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.27.2/lib/search.php#L143
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.27.2/lib/search.php#L132
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.27.2/lib/debug.php#L68
https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.27.2/lib/debug.php#L27