CVE-2026-3239 is a stored cross-site scripting vulnerability in the Strong Testimonials WordPress plugin (versions up to 3.2.21). The issue is due to improper neutralization of input during web page generation, specifically in the testimonial_view shortcode, where user-supplied attributes are not properly sanitized or escaped. Authenticated attackers with contributor-level privileges or higher can inject arbitrary JavaScript that executes in the context of users viewing the injected pages. This vulnerability can lead to limited confidentiality and integrity impacts but does not affect availability.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the testimonial_view shortcode. These scripts execute in the browsers of users who view the affected pages, potentially leading to theft of user data or session tokens (confidentiality impact) and unauthorized modification of displayed content (integrity impact). There is no impact on system availability. The vulnerability is rated medium severity with a CVSS score of 6.4.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or limiting use of the testimonial_view shortcode. Monitor for updates from the plugin vendor and apply patches promptly once available.