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CVE-2026-41905— FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl: redirect destination not re-validated, allowing internal HTTP / cloud-metadata access

Quick assessment

Affected
freescout-help-desk freescout
Exploitation
Public or AI PoC available; prioritize validation
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 1.8.217之前版本存在代码问题漏洞，该漏洞源于Helper::sanitizeRemoteUrl函数在跟随HTTP重定向后重新验证原始URL而非最终目标，可能导致攻击者将请求重定向到内部HTTP服务。

CVSS 7.7 · High EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
freescout-help-desk freescout < 1.8.217 affected
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I. Basic Information for CVE-2026-41905

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl: redirect destination not re-validated, allowing internal HTTP / cloud-metadata access
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 1.8.217, Helper::sanitizeRemoteUrl() in app/Misc/Helper.php follows HTTP redirects via curlGetLastRedirectedUrl() but then re-validates the original URL instead of the final redirect destination. An attacker who can supply any URL that passes the initial host check can redirect FreeScout to internal HTTP services (cloud metadata, internal APIs, RFC1918 ranges) that would normally be blocked. This issue has been patched in version 1.8.217.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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
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 1.8.217之前版本存在代码问题漏洞，该漏洞源于Helper::sanitizeRemoteUrl函数在跟随HTTP重定向后重新验证原始URL而非最终目标，可能导致攻击者将请求重定向到内部HTTP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
freescout-help-desk freescout < 1.8.217 -

II. Public POCs for CVE-2026-41905

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8073 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-41905

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Vendor Advisories for CVE-2026-41905 (1)

Vendor Pages for CVE-2026-41905 (1)

Same Patch Batch · freescout-help-desk · 2026-05-07 · 5 CVEs total

CVE-2026-41902 9.1 CRITICAL FreeScout's user invitation hash never expires: permanent unauthenticated account takeover
CVE-2026-41904 7.6 HIGH FreeScout Stored XSS vulnerability in mailbox auto-reply: payload reaches every customer's
CVE-2026-41906 7.1 HIGH FreeScout: Conversation Change-Customer Cross-Mailbox Authorization Bypass
CVE-2026-41903 5.4 MEDIUM FreeScout IDOR Vulnerability: PERM_EDIT_USERS allows modifying any user's notification sub

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41905

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