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CVE-2026-48707— InstantCMS vulnerable to SSRF via upload redirect bypass allows internal network service scanning

Quick assessment

Affected
instantsoft icms2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

instantSoft icms2是instantSoft公司的一套内容管理系统。 instantSoft icms2 2.18.2之前版本存在服务端请求伪造漏洞，该漏洞源于文件上传功能存在服务器端请求伪造漏洞，当“从URL上传”功能跟随HTTP重定向时，重定向目标URL绕过私有IP地址黑名单检查，可能导致已认证用户扫描和访问内部网络服务。

CVSS 3.1 · Low EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1019

Affected Version Matrix 1

VendorProduct Version RangeStatus
instantsoft icms2 < 2.18.2 affected
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I. Basic Information for CVE-2026-48707

Vulnerability Information
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Vulnerability Title
InstantCMS vulnerable to SSRF via upload redirect bypass allows internal network service scanning
Source: CVE Program / CVE List V5
Vulnerability Description
InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Server-Side Request Forgery (SSRF) vulnerability in the file upload functionality (`system/core/uploader.php` at lines 509-532). When the "upload from URL" feature follows an HTTP redirect, the redirected target URL bypasses the private IP address blacklist check. This allows authenticated users to scan and access internal network services. Version 2.18.2 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
instantSoft icms2 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
instantSoft icms2是instantSoft公司的一套内容管理系统。 instantSoft icms2 2.18.2之前版本存在服务端请求伪造漏洞，该漏洞源于文件上传功能存在服务器端请求伪造漏洞，当“从URL上传”功能跟随HTTP重定向时，重定向目标URL绕过私有IP地址黑名单检查，可能导致已认证用户扫描和访问内部网络服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
instantsoft icms2 < 2.18.2 -

II. Public POCs for CVE-2026-48707

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III. Intelligence Information for CVE-2026-48707

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Patches & Fixes for CVE-2026-48707 (1)

Vendor Advisories for CVE-2026-48707 (1)

IV. Related Vulnerabilities

Same product: icms2
Same vendor: instantsoft
Same weakness: CWE-918