CVE-2026-48707

Published: Sep 8, 2026Modified: Sep 8, 2026Deferred

3.1

Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploitability: 1.6 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-918

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

References (2)

https://github.com/instantsoft/icms2/commit/04b8fe0eb75fc5f44eecb15684c7d3660586683d

Source: security-advisories@github.com

https://github.com/instantsoft/icms2/security/advisories/GHSA-cm47-mwv3-f534

Source: security-advisories@github.com

Timeline

No history available yet.