The Testimonials Widget plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the plugin fails to adequately sanitize and escape user-supplied attributes in its testimonials shortcode, allowing authenticated users with contributor or higher privileges to inject arbitrary JavaScript code. This code executes in the context of any user viewing the injected page, potentially leading to session hijacking or other client-side attacks. The vulnerability affects all plugin versions up to 4.0.4. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, privileges required at the contributor level, no user interaction, and partial impact on confidentiality and integrity but no impact on availability. No patch or remediation details are currently provided by the vendor.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages using the testimonials shortcode. These scripts execute in the browsers of users who visit the affected pages, potentially compromising user sessions or data confidentiality and integrity. The vulnerability does not affect availability. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, limit contributor-level access to trusted users only and consider disabling or removing the Testimonials Widget plugin if possible to mitigate risk.