CVE-2025-59055CWE-918

InstantCMS vulnerable to Server-Side Request Forgery via package installer

Medium · published September 11, 2025

CVSS v3.1
4.7
EPSS
0%
Percentile
38.4
In the wild
Unconfirmed
What it is

InstantCMS is a free and open source content management system. A blind Server-Side Request Forgery (SSRF) vulnerability in InstantCMS up to and including 2.17.3 allows authenticated remote attackers to make nay HTTP/HTTPS request via the package parameter. It is possible to make any HTTP/HTTPS request to any website in installer functionality. Due to such vulnerability it is possible to for example scan local network, call local services and its functions, conduct a DoS attack, and/or disclose a server's real IP if it's behind a reverse proxy. It is also possible to exhaust server resources by sending plethora of such requests. As of time of publication, no patched releases are available.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00454 · 38.4th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2025-09-11T18:46Z
EPSS history
Timeline
  • 11 SEP 18:46Z
    InstantCMS vulnerable to Server-Side Request Forgery via package installer
    cvelistv5