The migumello Aggregator Advanced Settings plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, SVG file uploads are not properly sanitized or escaped, enabling authenticated users with Author-level privileges or above to embed arbitrary scripts. These scripts execute in the context of users viewing the SVG files, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all plugin versions up to and including 1.2.1. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the Author level, no user interaction, and impacts on confidentiality and integrity with no availability impact.

An authenticated attacker with Author-level access or higher can exploit this vulnerability to inject malicious scripts via SVG file uploads. These scripts execute in the browsers of users who view the SVG files, potentially compromising user sessions or performing actions with the user's privileges. The impact is limited to confidentiality and integrity, with no direct availability impact. There are no known exploits in the wild at this time.

No official patch or remediation has been published yet for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict Author-level access to trusted users only and consider disabling SVG file uploads if possible. Monitor for updates from the plugin vendor and apply any official fixes promptly once released.