CVE-2026-48810— FreeScout: Thread Edit Authorization Bypass via Missing Mailbox Check
Possible ATT&CK Techniques 2AI
T1068 · Exploitation for Privilege Escalation T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| freescout-help-desk | freescout | < 1.8.221 | affected |
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I. Basic Information for CVE-2026-48810
Vulnerability Information
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Vulnerability Title
FreeScout: Thread Edit Authorization Bypass via Missing Mailbox Check
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to 1.8.221, while investigating the ThreadPolicy::delete issue reported previously, the same missing mailbox membership check was found in the sibling ThreadPolicy::edit method. A user with the PERM_EDIT_CONVERSATIONS permission who created a message or internal note in Mailbox A can rewrite that thread's body after an administrator removes them from Mailbox A, because the policy checks only authorship and a global permission flag — not current mailbox membership. This vulnerability is fixed in 1.8.221.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeScout 授权问题漏洞
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 1.8.221之前版本存在授权问题漏洞，该漏洞源于ThreadPolicy::edit方法缺少邮箱成员资格检查，具有PERM_EDIT_CONVERSATIONS权限的用户在Mailbox A中创建消息或内部笔记后，即使管理员将其从Mailbox A中移除，仍可重写该线程的正文，因为策略仅检查作者身份和全局权限标志而非当前邮箱成员资格。
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-2026-48810
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-48810 (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-2026-48811 | 4.3 MEDIUM | FreeScout: Thread Deletion Bypasses Mailbox Access Revocation |
IV. Related Vulnerabilities
Same product: freescout
- CVE-2026-45294
FreeScout: User Account Enumeration via Password Reset Respo - CVE-2026-47123
FreeScout: Agent Impersonation via Missing HMAC Verification - CVE-2026-48811
FreeScout: Thread Deletion Bypasses Mailbox Access Revocatio - CVE-2026-41906
FreeScout: Conversation Change-Customer Cross-Mailbox Author - CVE-2026-41905
FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl:
Same vendor: freescout-help-desk
- CVE-2026-45294
FreeScout: User Account Enumeration via Password Reset Respo - CVE-2026-47123
FreeScout: Agent Impersonation via Missing HMAC Verification - CVE-2026-48811
FreeScout: Thread Deletion Bypasses Mailbox Access Revocatio - CVE-2026-41906
FreeScout: Conversation Change-Customer Cross-Mailbox Author - CVE-2026-41905
FreeScout vulnerable to SSRF via Helper::sanitizeRemoteUrl:
Same weakness: CWE-285
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Cisco Identity Services Engine Information Disclosure Vulner - CVE-2026-12213
hcengineering Huly Platform User Information operations.ts g - CVE-2026-47342
Apache OFBiz: Privilege Escalation via updateOrRemove Author - CVE-2026-46668
SpiceDB: Caveat structures with nested lists can result in i - CVE-2026-47298
Microsoft SharePoint Server Remote Code Execution Vulnerabil
V. Comments for CVE-2026-48810
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