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 ServiceGet alerts for future matching vulnerabilitiesLog in to subscribe
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)
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
- CVE-2026-47740
Shopper: Authorization bypass in multiple Livewire admin com - CVE-2026-10070
macrozheng mall Super Admin Password update improper authori - CVE-2026-47713
AnythingLLM: Legacy mobile device tokens bypass multi-user w - CVE-2026-45297
Cross-tenant IDOR on feature-flag and assist-stats routes vi - CVE-2026-47673
Hono: JWT middleware accepts any Authorization scheme, not o
V. Comments for CVE-2026-48810
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