The PluginOps Testimonial Slider plugin (up to version 3.5.8.6) contains an improper control of filename for include/require statements in PHP, classified as a PHP Remote File Inclusion vulnerability but specifically leading to Local File Inclusion (LFI). This vulnerability allows an attacker with low privileges to manipulate the filename parameter in the testimonial-add functionality, causing the application to include unintended local files. The CVSS 3.1 score is 8.8 (high), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and high impact on confidentiality, integrity, and availability.

Successful exploitation can lead to local file inclusion, enabling attackers to read sensitive files, execute arbitrary code, or cause denial of service. The impact is rated high due to the potential for full system compromise. There are no known exploits in the wild currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the vulnerable functionality to trusted users only and consider disabling the plugin if feasible. Monitor vendor channels for updates and apply patches promptly once available.