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CVE-2026-41903— FreeScout IDOR Vulnerability: PERM_EDIT_USERS allows modifying any user's notification subscriptions (incomplete fix of CVE-2025-48472)

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之前版本存在安全漏洞，该漏洞源于持有PERM_EDIT_USERS权限的用户可通过单个POST请求读取和修改其他用户的通知订阅，可能导致非管理员攻击者静默禁用管理员通知。

CVSS 5.4 · Medium EPSS 0.36% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
freescout-help-desk freescout < 1.8.217 affected
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I. Basic Information for CVE-2026-41903

Vulnerability Information
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Vulnerability Title
FreeScout IDOR Vulnerability: PERM_EDIT_USERS allows modifying any user's notification subscriptions (incomplete fix of CVE-2025-48472)
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 holding the PERM_EDIT_USERS permission (intended for general user-profile editing) can read and modify the notification subscriptions of any other user, including admins, by sending a single POST request. This is a sibling of CVE-2025-48472's notification authorization bypass — the prior fix did not cover this code path. A non-admin attacker can silently disable an admin's email/browser/mobile notifications, suppressing security alerts and conversation-assignment notices. 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:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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 1.8.217之前版本存在安全漏洞，该漏洞源于持有PERM_EDIT_USERS权限的用户可通过单个POST请求读取和修改其他用户的通知订阅，可能导致非管理员攻击者静默禁用管理员通知。
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-2026-41903

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III. Intelligence Information for CVE-2026-41903

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Vendor Advisories for CVE-2026-41903 (1)

Vendor Pages for CVE-2026-41903 (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-2026-41906 7.1 HIGH FreeScout: Conversation Change-Customer Cross-Mailbox Authorization Bypass

IV. Related Vulnerabilities

Same product: freescout
Same vendor: freescout-help-desk
Same weakness: CWE-863

V. Comments for CVE-2026-41903

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