Vulnerability · Published Oct 2, 2026 · Assigned by Wordfence
CVE-2026-97641Relevanssi <= 4.28.3 - Unauthenticated Stored Cross-Site Scripting via Comment Content
High 7.2
In plain English
A high-severity cross-site scripting in Relevanssi – A Better Search from comesio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official description
The Relevanssi – A Better Search plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 4.28.3 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 is only exploitable when the administrator has configured a non-empty value for the "Allowable tags in excerpts" setting, such as the default example value of <p><a><strong>, as the prefix-matching regex must have an allowable tag whose name is a prefix of the injected tag name.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| comesio | Relevanssi – A Better Search | 0 – through 4.28.3 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/47751ff1-2f22-4335-8e75-7ff1b6214426?source=cve
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/excerpts-highlights.php#L883
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/excerpts-highlights.php#L421
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/excerpts-highlights.php#L216
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/admin-ajax.php#L492
- https://plugins.trac.wordpress.org/browser/relevanssi/tags/4.28.3/lib/indexing.php#L1067
- https://github.com/msaari/relevanssi/commit/3dddec3416fbda298e18649127f31557398d10b0