CVE-2026-19985
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.
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Source
- security@wordfence.com
References
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.27.2/lib/debug.php#L27
- 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/search.php#L132
- 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#L562
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.1/lib/debug.php#L27
- 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/search.php#L132
- 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#L562
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3650355%40relevanssi%2Ftrunk&old=3529670%40relevanssi%2Ftrunk&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d07fe28c-f76e-42b2-b894-be316004235a?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.