Live › vulnerability › CVE-2026-116522
The Relevanssi search plugin for WordPress does not sanitize the 'comment' parameter, so an unauthenticated attacker can store scripts that run in the browser of anyone who opens an affected page. The payload only fires on singular pages reached through a Relevanssi search-result link carrying the highlight parameter, and only when comment indexing and comment highlighting are both enabled.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-31 07:34 UTC. All times on this page are UTC.
Sites running Relevanssi up to and including 4.28.5 with both comment indexing and comment highlighting turned on. Sites on other versions, or with either option off, are not exposed through this flaw as described. Unauthenticated visitors can plant the payload, so the site's own admin access is not required.
No product ranges from the sources yet.
4.28.5 in the WordPress admin plugin list or wp plugin list.4.28.5 are affected; the sources do not name a fixed version.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
The Relevanssi – A Better Search plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.28.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the site to have both the comment indexing and comment highlighting options enabled, and the payload only fires when a visitor reaches a singular page via a Relevanssi search-result permalink carrying the highlight query parameter.
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