CVE-2022-3539 in Testimonials Plugin
Summary
by MITRE • 11/14/2022
The Testimonials WordPress plugin before 2.7, super-testimonial-pro WordPress plugin before 1.0.8 do not sanitize and escape its settings, allowing high privilege users such as admin to perform cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
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Analysis
by VulDB Data Team • 04/30/2025
The vulnerability identified as CVE-2022-3539 affects two popular WordPress plugin ecosystems including the Testimonials plugin versions prior to 2.7 and the super-testimonial-pro plugin versions before 1.0.8. This security flaw represents a critical cross-site scripting vulnerability that exploits the improper handling of user input within plugin settings. The vulnerability stems from the failure of these plugins to adequately sanitize and escape user-provided data before rendering it within the WordPress admin interface or frontend output. The issue is particularly concerning because it allows users with administrative privileges to execute malicious scripts against other users who view the affected plugin settings or displayed testimonials.
The technical implementation of this vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications. The root cause lies in the plugins' failure to properly validate and escape user input through the WordPress plugin settings interface. Even when WordPress security measures such as disallowing unfiltered_html capability are in place, these vulnerable plugins bypass such protections by not implementing proper input sanitization routines. This creates a scenario where administrators can inject malicious javascript code through the plugin's settings forms, which then executes in the browsers of other users who access the affected pages.
The operational impact of this vulnerability extends beyond simple XSS attacks as it provides a potential entry point for more sophisticated exploitation chains. An attacker with administrative access can leverage this vulnerability to steal session cookies, redirect users to malicious sites, inject malware, or perform actions on behalf of other users. The attack vector is particularly dangerous because it targets the administrative interface where users have elevated privileges, allowing for privilege escalation attacks. This vulnerability can be exploited even in environments where standard WordPress security measures are properly configured, making it especially concerning for organizations with strict security policies.
Mitigation strategies for CVE-2022-3539 primarily involve immediate plugin updates to versions 2.7 and 1.0.8 respectively, which contain the necessary sanitization and escaping fixes. Organizations should also implement additional security measures such as monitoring for unauthorized plugin modifications and conducting regular security audits of installed plugins. The WordPress security framework recommends maintaining updated plugin versions and implementing proper input validation at all levels of application code. Security practitioners should consider implementing web application firewalls and content security policies to provide additional defense-in-depth measures against potential exploitation attempts. Regular security assessments of third-party plugins remain crucial for maintaining overall security posture in WordPress environments.