CVE-2026-6048 is a stored cross-site scripting vulnerability in the Flipbox Addon for Elementor WordPress plugin, affecting all versions up to 2.1.1. The issue arises from insufficient validation of custom attribute names in the Flipbox widget's button URL custom_attributes field. The plugin applies esc_html() to attribute names, which does not block event handler attributes such as onmouseover or onclick, allowing authenticated users with author-level privileges or higher to inject arbitrary JavaScript. This script executes whenever a user accesses the compromised page, potentially leading to client-side code execution within the context of the affected site.

An authenticated attacker with author-level or higher privileges can inject malicious scripts into pages via the vulnerable custom_attributes field. These scripts execute in the context of users viewing the affected pages, potentially leading to data theft, session hijacking, or other client-side attacks. The vulnerability does not affect availability and has limited impact on confidentiality and integrity as indicated by the CVSS vector (C:L/I:L/A:N). There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict author-level access to trusted users only and consider disabling or limiting use of the Flipbox widget's custom_attributes feature to reduce risk. Monitor vendor channels for updates and apply any official patches promptly once available.