CVE-2025-59055 – InstantCMS vulnerable to Server-Side Request Forgery via package installer

CVE ID : CVE-2025-59055

Published : Sept. 11, 2025, 7:15 p.m. | 1 hour, 27 minutes ago

Description : 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.

Severity: 4.7 | MEDIUM

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