PowerPack Addons for Elementor < 2.3.2 - Contributor+ Stored XSS

Description

The “Elementor Addons – PowerPack Addons for Elementor” WordPress Plugin before 2.3.2 for WordPress 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 “Advanced accordion” widget accepts a “title_html_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 the “title_html_tag” parameter, which is not filtered and is output without escaping. This JavaScript will then be executed when the saved page is viewed or previewed.

The “Counter” widget accepts a “title_html_tag” and a “subtitle_html_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 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:
content ticker: title_html_tag parameter
divider: text_html_tag parameter
flipbox: title_html_tag_front, title_html_tag_back parameters
dual-heading: heading_html_tag parameter
fancy-heading: heading_html_tag parameter
image-accordion: title_html_tag parameter
info-box-carousel: title_html_tag,sub_title_html_tag parameters
info-box: title_html_tag, sub_title_html_tag parameters
info-list: title_html_tag parameter
info-table: title_html_tag, sub_title_html_tag parameters
logo-carousel: title_html_tag parameter
logo-grid: title_html_tag parameter
skin-base: title_html_tag parameter
promo-box: heading_html_tag, sub_heading_html_tag parameters
team-member-carousel: name_html_tag, position_html_tag parameters
team-member: name_html_tag, position_html_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/