CVE-2026-62856

HIGH 7.7

FreeScout: Cross-User Notification Data Disclosure via LIKE Wildcard Injection in Polycast Channel Query

CVSS Score

7.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-89 CWE-200 CWE-639
Vendor	freescout-help-desk
Product	freescout
Published	Nov 6, 2026

Stay Ahead of the Next One

Get instant alerts for freescout-help-desk freescout

Be the first to know when new high vulnerabilities affecting freescout-help-desk freescout are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

freescout-help-desk / freescout

< 1.8.226

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj github.com: https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff github.com: https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855 github.com: https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226