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CVE-2026-41902— FreeScout's user invitation hash never expires: permanent unauthenticated account takeover if invite link leaks

CVSS 9.1 · Critical EPSS 0.03% · P9
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I. Basic Information for CVE-2026-41902

Vulnerability Information
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Vulnerability Title
FreeScout's user invitation hash never expires: permanent unauthenticated account takeover if invite link leaks
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 1.8.217, the /user-setup/{hash} endpoint accepts a 60-character random invite_hash to set a new user's password. The endpoint performs no expiration check — the hash remains valid indefinitely until consumed. Combined with realistic hash-leakage scenarios (forwarded invite emails, HTTP referrer to external CDNs on the setup page, server-side log exposure, abandoned invite emails in shared inboxes), this enables unauthenticated permanent account takeover months or years after invite issuance. If the leaked invite was sent to an admin, the takeover yields admin access. This issue has been patched in version 1.8.217.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的会话过期机制
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 1.8.217之前版本存在代码问题漏洞，该漏洞源于/user-setup/{hash}端点未对邀请哈希进行过期检查，可能导致未经验证的用户在哈希泄露后永久接管账户。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
freescout-help-deskfreescout < 1.8.217 -

II. Public POCs for CVE-2026-41902

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Qwen3.6-35B-A3B · 8775 chars
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III. Intelligence Information for CVE-2026-41902

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

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-2026-419067.1 HIGHFreeScout: Conversation Change-Customer Cross-Mailbox Authorization Bypass
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-613

V. Comments for CVE-2026-41902

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