CVE-2025-56236: Formcms

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in the avatar upload feature. Authenticated users can upload .html files containing malicious JavaScript, which are accessible via a public URL. When a privileged user accesses the file, the script executes in their browser context.

Affected products

• Formcms Formcms: from 0.5.5, before 0.5.7 (fixed in 0.5.7)

Published 2025-08-28. Last modified 2026-09-26.