The Shared Files – Frontend File Upload Form & Secure File Sharing plugin for WordPress is vulnerable to Stored Cross-Site Scripting via html File uploads in all versions up to, and including, 1.7.48 due to insufficient input sanitization and output escaping within the sanitize_file() function. This makes it possible for unauthenticated attackers to bypass the plugin’s MIME-only checks and inject arbitrary web scripts in pages that will execute whenever a user accesses the html file.
CVE ID: CVE-2025-4392
CVSS Base Severity: HIGH
CVSS Base Score: 7.2
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Vendor: anssilaitila
Product: Shared Files – Frontend File Upload Form & Secure File Sharing
EPSS Score: 0.11% (probability of being exploited)
EPSS Percentile: 31.12% (scored less or equal to compared to others)
EPSS Date: 2025-06-04 (when was this score calculated)