Executive brief
The Testimonial Slider and Showcase plugin for WordPress, which is used to display customer reviews on websites, contains a security flaw. This vulnerability allows a user with 'Editor' permissions to inject malicious code into testimonial titles. If an administrator or another user views the affected content, the malicious code could steal their login information or take over their session, potentially leading to a full site compromise.
Technical details
A stored cross-site scripting (XSS) vulnerability exists in the RadiusTheme Testimonial Slider and Showcase plugin for WordPress (version 2.2.6). The issue stems from a failure to properly sanitize user-supplied input in the 'post_title' parameter when creating or editing a testimonial. An authenticated attacker with Editor-level privileges can inject malicious JavaScript payloads into the testimonial title field. This script executes in the context of any user (including administrators) who views the draft or published testimonial, potentially allowing for session hijacking, cookie theft, or unauthorized administrative actions. A proof-of-concept exploit involving an 'onerror' attribute in an image tag has been publicly disclosed.
Affected products
- RadiusTheme Testimonial Slider and Showcase 2.2.6
Timeline
- 2022-09-02: disclosed: Exploit-DB entry published
- 2026-05-10: advisory: VulnCheck advisory published