CVE-2026-34443— FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Release 1.8.211 · freescout-help-desk/freescout · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-34443
IV. Related Vulnerabilities
Same product: freescout
- CVE-2026-41906
FreeScout: Conversation Change-Customer Cross-Mailbox Author - CVE-2026-41905
FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl: - CVE-2026-41904
FreeScout Stored XSS vulnerability in mailbox auto-reply: pa - CVE-2026-41902
FreeScout's user invitation hash never expires: permanent un - CVE-2026-41903
FreeScout IDOR Vulnerability: PERM_EDIT_USERS allows modifyi
Same vendor: freescout-help-desk
- CVE-2026-41906
FreeScout: Conversation Change-Customer Cross-Mailbox Author - CVE-2026-41905
FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl: - CVE-2026-41904
FreeScout Stored XSS vulnerability in mailbox auto-reply: pa - CVE-2026-41902
FreeScout's user invitation hash never expires: permanent un - CVE-2026-41903
FreeScout IDOR Vulnerability: PERM_EDIT_USERS allows modifyi
Same weakness: CWE-918
- CVE-2026-8193
Akaunting Invoice PDF Rendering dompdf.php server-side reque - CVE-2026-44313
LinkWarden: Server-Side Request Forgery (SSRF) in Link Creat - CVE-2026-42352
pygeoapi 0.23.x: Unauthenticated SSRF via OGC API - Processe - CVE-2026-42346
Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validatio - CVE-2026-42339
New API: SSRF Filter Bypass via 0.0.0.0
V. Comments for CVE-2026-34443
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