CVE-2026-107393— FreeScout: Stored HTML Injection in Administrator Alert Emails via Spoofed CF-Connecting-IP Header
Quick assessment
Affected
freescout-help-desk freescout
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
FreeScout 是一款自托管的帮助台系统和共享邮箱。在版本 1.8.235 之前，当启用 配置时，FreeScout 在登录失败时信任未经验证的 请求头，并将伪造的值记录到活动日志中。LogsMonitor 模块将该值插入到管理员警报电子邮件中，但未进行 HTML 转义处理，导致管理员在打开该电子邮件时可能执行注入的 HTML 代码（例如通过 HTML 注入实现跨站脚本攻击 XSS）。此问题已在版本 1.8.235 中得到修复。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-107393
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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: Stored HTML Injection in Administrator Alert Emails via Spoofed CF-Connecting-IP Header
Source: CVE Program / CVE List V5
Vulnerability Description
FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.235, when APP_CLOUDFLARE_IS_USED is enabled, FreeScout trusts an unvalidated CF-Connecting-IP header during failed login attempts and stores the spoofed value in the activity log. LogsMonitor inserts the value into an administrator alert email without HTML escaping, allowing injected HTML to execute when an administrator opens the email. This issue is fixed in version 1.8.235.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| freescout-help-desk | freescout | < 1.8.235 | - |
|
II. Public POCs for CVE-2026-107393
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-107393
请登录查看更多情报信息。
Other References for CVE-2026-107393 (3)
IV. Related Vulnerabilities
Same product: freescout
-
CVE-2026-53596
FreeScout has unrestricted file upload without rate limiting -
CVE-2026-53595
FreeScout vulnerable to anonymous account takeover via /user -
CVE-2026-53594
FreeScout has Arbitrary File Read in App Logs Viewer via For -
CVE-2026-53593
FreeScout Vulnerable to Authenticated Remote Code Execution -
CVE-2026-53592
FreeScout vulnerable to prototype pollution in getQueryParam
Same vendor: freescout-help-desk
-
CVE-2026-53596
FreeScout has unrestricted file upload without rate limiting -
CVE-2026-53595
FreeScout vulnerable to anonymous account takeover via /user -
CVE-2026-53594
FreeScout has Arbitrary File Read in App Logs Viewer via For -
CVE-2026-53593
FreeScout Vulnerable to Authenticated Remote Code Execution -
CVE-2026-53592
FreeScout vulnerable to prototype pollution in getQueryParam
Same weakness: CWE-79
-
CVE-2026-107801
Jivejdon through 5.0 Stored XSS via Attachment Upload Conten -
CVE-2026-107800
Jivejdon through 5.0 Stored XSS via Private Short Messages -
CVE-2026-107799
Jivejdon through 5.0 Stored XSS via messageListBody.jsp Foru -
CVE-2026-107797
Jivejdon through 5.0 Reflected XSS via postThread.jsp to and -
CVE-2026-107798
Jivejdon through commit ee67a65e Stored XSS via Markdown Lin
V. Comments for CVE-2026-107393
No comments yet