VULNERABILITY INTELLIGENCE
CVE-2026-48707
CVSS score3.1 LOW
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-09-08
Last modified2026-09-11
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Description
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.
Weakness classification
- security-advisories@github.com: CWE-918