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CVE-2026-41904— FreeScout Stored XSS vulnerability in mailbox auto-reply: payload reaches every customer's email client (no CSP), bypassing strip_tags validator with mixed text+HTML content

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之前版本存在跨站脚本漏洞，该漏洞源于具有updateAutoReply权限的用户可在邮箱自动回复消息中存储XSS载荷，该载荷在未转义的情况下发送给客户，可能导致XSS攻击。

CVSS 7.6 · High EPSS 0.30% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
freescout-help-desk freescout < 1.8.217 affected
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I. Basic Information for CVE-2026-41904

Vulnerability Information
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Vulnerability Title
FreeScout Stored XSS vulnerability in mailbox auto-reply: payload reaches every customer's email client (no CSP), bypassing strip_tags validator with mixed text+HTML content
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, a user with updateAutoReply permission can store an XSS payload in the mailbox auto-reply message. The payload is rendered unescaped in the auto-reply email sent to every customer who contacts the mailbox. Email clients do not enforce CSP, so the payload executes in the customer's webmail / mail-client context. 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:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
FreeScout 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于具有updateAutoReply权限的用户可在邮箱自动回复消息中存储XSS载荷，该载荷在未转义的情况下发送给客户，可能导致XSS攻击。
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-2026-41904

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7915 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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III. Intelligence Information for CVE-2026-41904

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Vendor Advisories for CVE-2026-41904 (1)

Vendor Pages for CVE-2026-41904 (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-2026-41906 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-79

V. Comments for CVE-2026-41904

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