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CVE-2026-34443— FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()

Quick assessment

Affected
freescout-help-desk freescout
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.

FreeScout是FreeScout公司的一个使用 PHP（Laravel 框架）构建的超轻量级且功能强大的免费开源帮助台和共享收件箱。 FreeScout 1.8.211之前版本存在代码问题漏洞，该漏洞源于checkIpByMask函数存在逻辑错误，可能导致对私有IP地址范围的保护失效。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2026-34443

Vulnerability Information
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Vulnerability Title
FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()
Source: CVE Program / CVE List V5
Vulnerability Description
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.211, checkIpByMask() in app/Misc/Helper.php checks whether the input IP contains a / character. Plain IP addresses never contain /, so the function always returns false without checking any CIDR ranges. The entire 10.0.0.0/8 and 172.16.0.0/12 private ranges are unprotected. This issue has been patched in version 1.8.211.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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
FreeScout 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeScout是FreeScout公司的一个使用 PHP（Laravel 框架）构建的超轻量级且功能强大的免费开源帮助台和共享收件箱。 FreeScout 1.8.211之前版本存在代码问题漏洞，该漏洞源于checkIpByMask函数存在逻辑错误，可能导致对私有IP地址范围的保护失效。
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
freescout-help-desk freescout < 1.8.211 -

II. Public POCs for CVE-2026-34443

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III. Intelligence Information for CVE-2026-34443

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Vendor Advisories for CVE-2026-34443 (1)

Vendor Pages for CVE-2026-34443 (1)

IV. Related Vulnerabilities

Same product: freescout
Same vendor: freescout-help-desk
Same weakness: CWE-918

V. Comments for CVE-2026-34443

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