Description
The Strong Testimonials plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'lightbox_class' Shortcode Attribute in all versions up to, and including, 3.3.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that the targeted testimonial view has at least one published testimonial with a featured image and the lightbox wrapper enabled, as the vulnerable code path is only reached when a thumbnail is rendered.
References5
- plugins.trac.wordpress.org/browser/strong-testimonials/tags/3.3…
- plugins.trac.wordpress.org/browser/strong-testimonials/tags/3.3…
- plugins.trac.wordpress.org/browser/strong-testimonials/tags/3.3…
- plugins.trac.wordpress.org/changeset?reponame=&old=3699887%40st…
- www.wordfence.com/threat-intel/vulnerabilities/id/52a92e3c-cb64…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 27 · as of 8 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.