CVE-2026-48707: Instantsoft ICMS2

Low severity, CVSS 3.1. EPSS: 0.3% chance of exploitation in the next 30 days.

InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Server-Side Request Forgery (SSRF) vulnerability in the file upload functionality (`system/core/uploader.php` at lines 509-532). When the "upload from URL" feature follows an HTTP redirect, the redirected target URL bypasses the private IP address blacklist check. This allows authenticated users to scan and access internal network services. Version 2.18.2 contains a fix.

Affected products

• Instantsoft ICMS2: before 2.18.2 (fixed in 2.18.2)

Published 2026-09-08. Last modified 2026-09-11.