🛡️ CVE-2025-59055 — instantcms

🟡 CVSS 4.7 — Medium ⚠️ Exploit Public CWE-918 NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability low.

Weakness class

CVE-2025-59055 is classified as CWE-918: Server-Side Request Forgery (SSRF). The server fetches a URL supplied by the caller, which can be pointed at internal systems it alone can reach.

Affected software

CVE-2025-59055 is recorded against 1 package.

  • instantcms (fixed in 2.17.3)

Timeline and source

Published on 11 September 2025 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com

Details

Severity MEDIUM
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
CWE CWE-918
Public Exploit ⚠️ Yes
Source NVD
Published 2025-09-11
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
instantcms — 2.17.3

Similar Threats

Exploit Protection

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