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4.4
Client Testimonial Slider plugin allows attackers to inject malicious scripts on WordPress sites
CVE-2026-2716
Summary
A security flaw in the Client Testimonial Slider plugin for WordPress can let attackers inject malicious scripts into pages viewed by other users. This only affects WordPress sites with this plugin installed, especially those with multiple sites or where certain security settings are disabled. Update the plugin to the latest version to fix this issue.
Original title
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 insuf...
Original description
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.
nvd CVSS3.1
4.4
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 19 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026