A reflected Cross-Site Scripting (XSS) Vulnerability in the KingComposer plugin through 2.9.4 for WordPress allows remote attackers to trick a victim into submitting an install_online_preset AJAX request containing base64-encoded JavaScript (in the kc-online-preset-data POST parameter) that is executed in the victim’s browser.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15299
Reference (s):
- https://www.wordfence.com/blog/2020/07/xss-flaw-impacting-100000-sites-patched-in-kingcomposer/