---
id: CVE-2026-62856
title: >-
  FreeScout: Cross-User Notification Data Disclosure via LIKE Wildcard Injection
  in Polycast Channel Query
summary: "FreeScout is a self-hosted help desk and shared mailbox application. Prior to version 1.8.226, the \_polycast/receive\_ endpoint fails to escape SQL LIKE wildcards in supplied channel names, while channel authorization applies only to name…"
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-89
  - CWE-200
  - CWE-639
vendor: freescout-help-desk
product: freescout
affected:
  - freescout < 1.8.226
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:00:33.424Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-62856'
references:
  - url: >-
      https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj
    label: >-
      https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj
  - url: >-
      https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff
    label: >-
      https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff
  - url: >-
      https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855
    label: >-
      https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855
  - url: 'https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226'
    label: 'https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226'
tags:
  - cve.org
ingestedAt: '2026-11-06T18:00:12.576Z'
epss: 0.00256
epssPercentile: 0.17394
---

## Overview

FreeScout is a self-hosted help desk and shared mailbox application. Prior to version 1.8.226, the  polycast/receive  endpoint fails to escape SQL LIKE wildcards in supplied channel names, while channel authorization applies only to names with specific prefixes. An unauthenticated attacker with a guest session and valid CSRF token can submit a wildcard channel name to retrieve matching notification events intended for other users. Notification payload generation lacks a corresponding access check, exposing conversation message content, identifiers, URLs, and notification HTML across users and mailboxes. This issue is fixed in version 1.8.226.

## Affected

- `freescout < 1.8.226`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.