CVE-2026-48707Public exploitNetwork attack vector

Internal network access via unchecked redirect targets

Published Sep 8, 2026 · Updated Sep 8, 2026

SSRF in InstantCMS before 2.18.2 allows remote authenticated users to scan and access internal network services through file uploads. The uploadFromLink() redirect path in system/core/uploader.php recursively fetches a Location target without repeating the private or reserved IP check. Access requires an authenticated account with the upload-from-URL feature, and responses expose internal service reachability or content.

CVSS severity3.1
Low
EPSS probability0.21%
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 before 2.18.2 allows remote authenticated users to scan and access internal network services through file uploads. The uploadFromLink() redirect path in system/core/uploader.php recursively fetches a Location target without repeating the private or reserved IP check. Access requires an authenticated account with the upload-from-URL feature, and responses expose internal service reachability or content.

The record

CVE
CVE-2026-48707
Published
Sep 8, 2026
Updated
Sep 8, 2026
Vendor
InstantCMS Team
Product
InstantCMS
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record 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=< 2.18.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

InstantCMS Team · InstantCMSversion=< 2.18.2

Published CVSS scores

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
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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