Sina Extension for Elementor < 3.3.12 - Contributor+ Stored XSS

Description

The “Sina Extension for Elementor” WordPress Plugin before 3.3.12 has several widgets that are vulnerable to stored Cross-Site Scripting (XSS) by lower-privileged users such as contributors, all via a similar method.

The “Banner Slider” widget accepts a “title_tag” and a “subtitle_tag” parameter. Although the element control lists a fixed set of possible html tags, it is possible to send a ‘save_builder’ request containing JavaScript in either of these parameters, which is not filtered and is output without escaping. This JavaScript will then be executed when the saved page is viewed or previewed.

Additionally the following widgets appear to have similar vulnerabilities:
Sina Content Slider:title_tag,subtitle_tag parameters
Sina Particle Layer:title_tag parameter
Sina title:title_tag,subtitle_tag parameters

These vulnerabilities are nearly identical to the vulnerabilities we have recently disclosed in the main Elementor plugin: https://www.wordfence.com/blog/2021/03/cross-site-scripting-vulnerabilities-in-elementor-impact-over-7-million-sites/