Fahad Mahmood RSS Feed Widget Plugin v2.7.9 and lower does not sanitize the value of the “t” GET parameter before echoing it back out inside an input tag. This results in a reflected XSS vulnerability that attackers can exploit with a specially crafted URL.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24314
Reference (s):
- https://wordpress.org/plugins/rss-feed-widget/advanced/
- https://zeroaptitude.com/zerodetail/wordpress-plugin-bug-hunting-part-1/