What is CVE-2025-59055?

CVE-2025-59055 is a medium-severity vulnerability in Instantcms, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.7/10. Published 2025-09-11.

How severe is CVE-2025-59055?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Is CVE-2025-59055 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SSRF in Instantcms

CVE-2025-59055

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2025-09-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.005 (36.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Instantcms
Instantsoft Icms2 — versions <= 2.17.3

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

github.com/instantsoft/icms2/security/advisories/GHSA-79hh-mhvg-whrw (Exploit, Vendor Advisory)
github.com/instantsoft/icms2/commit/fa997bdab3429fad0c850966bfacbcb96d5ab041 (Patch)

Frequently asked questions

What is CVE-2025-59055?: CVE-2025-59055 is a medium-severity vulnerability in Instantcms, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.7/10. Published 2025-09-11.
How severe is CVE-2025-59055?: Medium severity. CVSS v3 base score is 4.7 out of 10.
Is CVE-2025-59055 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.