The Custom Post Carousels with Owl WordPress plugin before 1.4.12 uses the featherlight library and makes use of the data-featherlight attribute without sanitizing before using it.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Howard Ehrenberg Custom Post Carousels with Owl allows Stored XSS.This issue affects Custom Post Carousels with Owl: from n/a through 1.4.6.