I have the same issue on a clients website.
SolidWP reports this issue:
“WordPress WP Logo Showcase Responsive Slider and Carousel plugin <= 3.6 – Broken Access Control vulnerability.
Broken Access Control vulnerability discovered by Abdi Pranata (Patchstack Alliance) in WordPress Plugin WP Logo Showcase Responsive Slider and Carousel (versions <= 3.6)”
https://patchstack.com/database/vulnerability/wp-logo-showcase-responsive-slider-slider/wordpress-wp-logo-showcase-responsive-slider-and-carousel-plugin-3-6-broken-access-control-vulnerability?_a_id=431
