CVE-2023-26013 in Strong Testimonials Plugin
Summary
by MITRE • 06/16/2023
Auth. (contributor+) Stored Cross-Site Scripting (XSS) vulnerability in WPChill Strong Testimonials plugin <= 3.0.2 versions.
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Analysis
by VulDB Data Team • 07/14/2023
The CVE-2023-26013 vulnerability represents a critical stored cross-site scripting flaw within the WPChill Strong Testimonials WordPress plugin, affecting versions 3.0.2 and earlier. This vulnerability specifically targets users with contributor roles or higher privileges, making it particularly concerning for WordPress environments where multiple user roles exist. The flaw allows authenticated attackers to inject malicious scripts into testimonial content that gets stored on the server and subsequently executed whenever the testimonial is displayed to other users. The vulnerability stems from insufficient input sanitization and output escaping mechanisms within the plugin's testimonial submission and rendering processes. When administrators or contributors create testimonials through the WordPress admin interface, the plugin fails to properly validate or escape user-supplied content before storing it in the database, creating an environment where malicious payloads can persist indefinitely.
The technical implementation of this vulnerability involves the plugin's handling of user input in testimonial fields without adequate sanitization measures. Attackers with contributor privileges or higher can craft malicious JavaScript payloads within testimonial content that bypass the standard WordPress content filtering mechanisms. These payloads are then stored in the database and executed in the context of other users' browsers when they view the testimonials, typically through frontend display mechanisms or admin interfaces where testimonials are rendered. The vulnerability is classified as a stored XSS because the malicious script is permanently stored on the server rather than being reflected in a single HTTP response, making it particularly dangerous as it can affect multiple users over time. This flaw directly violates the principle of least privilege and proper input validation as outlined in CWE-79, which specifically addresses cross-site scripting vulnerabilities where untrusted data is not properly escaped before being rendered in web pages.
The operational impact of CVE-2023-26013 extends beyond simple script execution, as it provides attackers with the ability to perform session hijacking, credential theft, and other malicious activities within the context of the vulnerable WordPress installation. An attacker could potentially steal cookies, execute unauthorized administrative actions, or redirect users to malicious sites. The vulnerability affects not only the plugin's functionality but also the broader WordPress security posture, as it allows privilege escalation through the testimonial management system. Organizations running affected versions of the WPChill Strong Testimonials plugin face significant risk of data compromise and potential lateral movement within their network infrastructure. The impact is particularly severe in environments where multiple contributors have access to testimonial creation features, as the attack surface expands with each authenticated user who can potentially introduce malicious content.
Mitigation strategies for CVE-2023-26013 should prioritize immediate plugin updates to versions 3.0.3 or later, which contain the necessary security patches addressing the XSS vulnerability. Administrators should also implement additional security measures including regular security audits of installed plugins, monitoring of user activity logs for suspicious testimonial submissions, and implementation of web application firewalls to detect and block malicious payloads. The vulnerability demonstrates the importance of proper content sanitization and output escaping as recommended by the OWASP Top Ten and ATT&CK framework techniques related to web application security. Organizations should also consider implementing role-based access controls to limit testimonial creation privileges to only essential administrators, reducing the attack surface for potential XSS exploitation. Regular vulnerability scanning and security assessments of WordPress installations remain crucial for identifying similar vulnerabilities in other plugins or themes that may not have received timely security updates.