What is the CVSS score of CVE-2025-59055?

CVE-2025-59055 has a CVSS 3.1 base score of 4.7 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L. EPSS exploitation probability: 0.2%.

Which versions of Instantcms are affected by CVE-2025-59055?

Organizations using InstantCMS should be aware of moderate risk from CVE-2025-59055, a server-side request forgery vulnerability rated CVSS 4.7.. A patch is available.

Is there a public PoC exploit available for CVE-2025-59055?

Yes, a public proof-of-concept exploit is available for CVE-2025-59055. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-59055?

During next maintenance window: Identify affected systems running InstantCMS and apply vendor patches when convenient. Vendor patch is available.

Instantcms CVE-2025-59055

MEDIUM

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

2025-09-11 security-advisories@github.com

SSRF Instantcms

4.7

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.7 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:11 vuln.today

Patch released

Mar 28, 2026 - 19:11 nvd

Patch available

PoC Detected

Sep 24, 2025 - 13:30 vuln.today

Public exploit code

CVE Published

Sep 11, 2025 - 19:15 nvd

MEDIUM 4.7

DescriptionGitHub Advisory

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.

AnalysisAI

InstantCMS is a free and open source content management system. Rated medium severity (CVSS 4.7), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Server-Side Request Forgery (SSRF) (CWE-918), which allows attackers to make the server perform requests to unintended internal or external resources. 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. Affected products include: Instantcms.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate and allowlist destination URLs, block requests to internal networks, use network segmentation.

CVE-2025-59055 vulnerability details – vuln.today

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