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

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 1.8.214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。

CVSS 7.1 · High EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
freescout-help-desk freescout < 1.8.214 affected
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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: 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 1.8.214, 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
freescout-help-desk freescout < 1.8.214 -

II. Public POCs for CVE-2026-41906

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11813 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-2026-41906

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Vendor Advisories for CVE-2026-41906 (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-2026-41905 7.7 HIGH FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl: redirect destination not re-va
CVE-2026-41904 7.6 HIGH FreeScout Stored XSS vulnerability in mailbox auto-reply: payload reaches every customer's
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-639

V. Comments for CVE-2026-41906

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