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CVE-2026-41906— FreeScout: Conversation Change-Customer Cross-Mailbox Authorization Bypass

CVSS 7.1 · High EPSS 0.03% · P7
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I. Basic Information for CVE-2026-41906

Vulnerability Information
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Vulnerability Title
FreeScout: Conversation Change-Customer Cross-Mailbox Authorization Bypass
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 1.8.214, the Change Customer modal correctly hides out-of-scope customers through the mailbox-filtered search endpoint, but the backend conversation_change_customer action accepts any supplied customer_email. A low-privileged agent can forge a request and bind a visible conversation to a hidden customer in another mailbox. This issue has been patched in version 1.8.214.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeScout 安全漏洞
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 1.8.214之前版本存在安全漏洞，该漏洞源于conversation_change_customer操作接受任意提供的customer_email，可能导致低权限代理将可见对话绑定到其他邮箱中的隐藏客户。
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

VendorProductAffected VersionsCPESubscribe
freescout-help-deskfreescout < 1.8.214 -

II. Public POCs for CVE-2026-41906

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11813 chars
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III. Intelligence Information for CVE-2026-41906

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

CVE-2026-419029.1 CRITICALFreeScout's user invitation hash never expires: permanent unauthenticated account takeover
CVE-2026-419057.7 HIGHFreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl: redirect destination not re-va
CVE-2026-419047.6 HIGHFreeScout Stored XSS vulnerability in mailbox auto-reply: payload reaches every customer's
CVE-2026-419035.4 MEDIUMFreeScout 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-639

V. Comments for CVE-2026-41906

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