CVE-2024-13660 is a stored cross-site scripting vulnerability in the Responsive Flickr Slideshow WordPress plugin caused by improper neutralization of input in the 'fshow' shortcode. This allows authenticated users with contributor or higher privileges to inject arbitrary web scripts that execute in other users' browsers when viewing the affected pages. The vulnerability arises from insufficient input sanitization and output escaping of user-supplied shortcode attributes. It affects all versions up to and including 2.6.1. The CVSS 3.1 base score is 6.4 (medium severity), reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity but not availability.

An attacker with contributor-level access or higher can inject malicious scripts into pages using the vulnerable shortcode, leading to potential unauthorized actions or data exposure in users' browsers who view those pages. The impact affects confidentiality and integrity but does not affect availability. There are no reports of active exploitation currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the Responsive Flickr Slideshow plugin if possible to prevent exploitation.