CVE-2025-59055Public exploitNetwork attack vector

Authenticated SSRF via unrestricted package URL

Published Sep 11, 2025 · Updated Sep 11, 2025

SSRF in InstantCMS 2.17.3 and earlier allows remote authenticated users to make arbitrary HTTP or HTTPS requests through the installer. The admin install action passes the package URL to cmsUploader remote upload without restricting its host, so the server retrieves attacker-chosen destinations. Administrator access is required; requests can reach internal services, scan local networks, disclose origin IPs, or exhaust server resources.

CVSS severity4.7
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in InstantCMS 2.17.3 and earlier allows remote authenticated users to make arbitrary HTTP or HTTPS requests through the installer. The admin install action passes the package URL to cmsUploader remote upload without restricting its host, so the server retrieves attacker-chosen destinations. Administrator access is required; requests can reach internal services, scan local networks, disclose origin IPs, or exhaust server resources.

The record

CVE
CVE-2025-59055
Published
Sep 11, 2025
Updated
Sep 11, 2025
Vendor
InstantCMS Team
Product
InstantCMS
Classifications
CWE-918, T1046
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.17.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

InstantCMS Team · InstantCMSversion=<= 2.17.3

Published CVSS scores

4.7GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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