What the vulnerability does
01Description
The Client Testimonial Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Testimonial Heading' setting in all versions up to, and including, 2.0. This is due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Explanation of Vulnerability in Simple Terms
02Summary
Client Testimonial Slider versions 2.0 and earlier contain a cross-site scripting vulnerability. An attacker with high privileges can inject malicious scripts that affect other users or components on the site. The vulnerability requires high attack complexity and does not require user interaction to trigger.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers or affect site functionality.
Potential impact on your site
04Site Impact
A privileged user could inject code affecting other users or site behavior; scope extends beyond the plugin.
Conditions required to exploit
05Prerequisites
Attacker must have high-level privileges (e.g., admin or editor role) on the site.
Key dates
06Disclosure timeline
February 19, 2026
CVE published
April 8, 2026
Record updated
