CVE-2026-62852
Received Received - Intake

RealtimeConvNewThread Privilege Escalation in FreeScout

Publication date: 2026-11-06

Last updated on: 2026-11-06

Assigner: GitHub, Inc.

Description
FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.226, RealtimeConvNewThread checks only general mailbox access and does not apply the conversation-level restriction for users configured to see only assigned conversations. A restricted authenticated user can subscribe to predictable conv.<conversation_id> Polycast channels for other conversations in the same mailbox. New event payloads can expose complete replies, internal notes, recipient addresses, conversation state, assignee data, attachment names, and attachment URLs containing valid download tokens. This issue is fixed in version 1.8.226.

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Meta Information

Published
2026-11-06
Last Modified
2026-11-06
Generated
2026-11-06
AI Q&A
2026-11-06
EPSS Evaluated
N/A
NVD
CVE-2026-62852
EUVD
EUVD-2026-118374

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
freescout freescout to 1.8.226 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability in FreeScout versions before 1.8.226 involves missing authorization checks in realtime Polycast event handling. Specifically, the RealtimeConvNewThread event fails to enforce conversation-level access controls. An authenticated user with restricted access can subscribe to predictable conversation channels and intercept realtime updates for conversations they are not authorized to view.

Detection Guidance

To detect this vulnerability, check FreeScout versions before 1.8.226. Inspect Polycast channel subscriptions for predictable conv.<conversation_id> patterns. Monitor realtime event logs for unauthorized access attempts to conversations outside assigned permissions.

Impact Analysis

An attacker with a low-privileged account can access sensitive data from conversations they should not see. This includes complete replies, internal notes, recipient addresses, conversation state, assignee data, attachment names, and download URLs. The attack can be automated by guessing conversation IDs and may allow ongoing surveillance of conversations for up to two minutes.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive personal data, internal notes, and attachments. For GDPR, this may violate principles of data minimization and security. For HIPAA, it could expose protected health information. Organizations using affected versions may face compliance violations and potential regulatory penalties.

Mitigation Strategies

Upgrade FreeScout to version 1.8.226 or later immediately. Apply conversation-level authorization checks for realtime events. Restrict Polycast channel access to authorized users only. Review logs for past unauthorized access attempts.

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