CVE-2026-48707

Summary

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 Software

VendorProductVersion RangeStatus
instantsofticms2< 2.18.2affected

Weaknesses

  • CWE-918: CWE-918: Server-Side Request Forgery (SSRF)

References