CVE-2024-9504 affects the wpdevart Booking calendar, Appointment Booking System WordPress plugin, allowing unauthenticated attackers to upload SVG files containing malicious scripts due to improper input validation and output escaping. This stored XSS vulnerability enables script execution in the context of users viewing the uploaded SVG files. The issue is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type). The CVSS 3.1 base score is 7.2 (high), with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts confidentiality and integrity with scope change. No patch or official remediation guidance is currently available, and the plugin is not a cloud service.

Successful exploitation allows unauthenticated attackers to inject and execute arbitrary web scripts in the context of users accessing the malicious SVG files, potentially leading to data disclosure or integrity issues within affected WordPress sites using the vulnerable plugin. There is no indication of availability impact. No known exploits in the wild have been reported to date.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider disabling SVG uploads or restricting file upload capabilities to trusted users only. Monitoring for suspicious SVG files and applying web application firewall (WAF) rules targeting SVG-based XSS may provide temporary mitigation.