CVE-2026-19985 Relevanssi <= 4.28.1 - Reflected Cross-Site Scripting
Unauthenticated attackers can inject arbitrary scripts via crafted links if the plugin's debugging mode is enabled, leading to potential session hijacking or malicious actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-19985?
CVE-2026-19985 is a medium-severity cross-site scripting vulnerability in comesio Relevanssi – A Better Search, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-19985?
How do I fix CVE-2026-19985?
No fix has been published for CVE-2026-19985 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-19985 being exploited?
There is no known exploitation of CVE-2026-19985 in the wild and no public exploit code.
Sources
Also known as GHSA-342h-68mm-3pfr.