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CVE-2026-48811— FreeScout: Thread Deletion Bypasses Mailbox Access Revocation

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 1.8.221之前版本存在安全漏洞，该漏洞源于ThreadPolicy::delete授权策略未验证邮箱成员资格，非管理员用户可永久删除任何对话中的内部笔记，即使其对包含该对话的邮箱的访问已被撤销，前团队成员仍保留对其创建笔记的破坏性写入权限。

CVSS 4.3 · Medium EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
freescout-help-desk freescout < 1.8.221 affected
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I. Basic Information for CVE-2026-48811

Vulnerability Information
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Vulnerability Title
FreeScout: Thread Deletion Bypasses Mailbox Access Revocation
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 1.8.221, FreeScout allows a non-admin user to permanently delete an internal note (private thread) from any conversation, even after that user's access to the mailbox containing the conversation has been revoked. The ThreadPolicy::delete authorization policy does not verify mailbox membership, so a former team member retains destructive write access to notes they created. This vulnerability is fixed in 1.8.221.
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 1.8.221之前版本存在安全漏洞，该漏洞源于ThreadPolicy::delete授权策略未验证邮箱成员资格，非管理员用户可永久删除任何对话中的内部笔记，即使其对包含该对话的邮箱的访问已被撤销，前团队成员仍保留对其创建笔记的破坏性写入权限。
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 < 1.8.221 -

II. Public POCs for CVE-2026-48811

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III. Intelligence Information for CVE-2026-48811

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Vendor Advisories for CVE-2026-48811 (1)

Same Patch Batch · freescout-help-desk · 2026-05-29 · 4 CVEs total

CVE-2026-47123 7.5 HIGH FreeScout: Agent Impersonation via Missing HMAC Verification on Notification Reply Message
CVE-2026-45294 5.3 MEDIUM FreeScout: User Account Enumeration via Password Reset Response Differentiation
CVE-2026-48810 4.3 MEDIUM FreeScout: Thread Edit Authorization Bypass via Missing Mailbox Check

IV. Related Vulnerabilities

Same product: freescout
Same vendor: freescout-help-desk
Same weakness: CWE-862

V. Comments for CVE-2026-48811

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