TI-2026-86038 Aliases CVE-2026-85744

Cross-mailbox authorization bypass in FreeScout conversation merge

LOW 24CWE-863Published 2026-11-06 · Updated 2026-11-06

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

FreeScout from freescout-help-desk is affected before 1.8.227. Incorrect authorization (CWE-863) in the conversation_merge action lets an authenticated agent merge a conversation they control into a target conversation in a mailbox they cannot access. The merge adds threads, attachments and audit records to the target and deletes the source conversation, but it does not reveal the target's existing contents.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.227, the conversation_merge action records a failed authorization check for the target conversation in response['msg'] and then clears that value inside the source-conversation loop. An authenticated agent can merge a conversation they control into a target conversation in a mailbox they cannot access. The operation injects threads, attachments, and audit records into the unauthorized target and deletes the source conversation, but it does not disclose the target's existing contents. This issue is fixed in version 1.8.227.

Why it matters now

EPSS 0.00211 11th percentileScored 2026-11-07

Fix Fixed freescout (freescout-help-desk): 1.8.227

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
freescout-help-desk	freescout	before 1.8.227	1.8.227	Patch available	CNA

freescout Vendorfreescout-help-desk Affected before 1.8.227 Fixed in 1.8.227 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:freescout:freescout::::::::	—	—	freescout-help-desk

cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:* Versions — — ·freescout-help-desk

Remediation

Update FreeScout to version 1.8.227, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA freescout (freescout-help-desk) Fixed in 1.8.227

Timeline

2026-11-06 Threatist record created from CVE-2026-85744
2026-11-08 Priority changed: MEDIUM → LOW

References

Other 3

TI-2026-38652 FreeScout vulnerable to anonymous account takeover via /user-setup empty invite_hash on MySQL CVSS 3.1CRITICAL 9.4
TI-2026-22019 FreeScout's Predictable Authentication Token Enables Account Takeover CVSS 3.1CRITICAL 9.8
TI-2026-30304 FreeScout's user invitation hash never expires: permanent unauthenticated account takeover if invite link leaks CVSS 3.1CRITICAL 9.1
TI-2026-29249 FreeScout has Authentication Bypass and Information Disclosure in SystemController via /system/cron CVSS 4.0HIGH 8.9
TI-2026-29247 FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force CVSS 4.0HIGH 8.8
TI-2026-38648 FreeScout Vulnerable to Unauthenticated Conversation Thread Injection via HMAC Length Bypass in FetchEmails CVSS 3.1HIGH 8.6

See all 90 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences