freescout-help-desk FreeScout up to 1.8.225 Notification Payload Generation channel_name sql injection

Summaryinfo

A vulnerability has been found in freescout-help-desk FreeScout up to 1.8.225 and classified as critical. This issue affects some unknown processing of the component Notification Payload Generation. The manipulation of the argument channel_name leads to sql injection. This vulnerability is traded as CVE-2026-62856. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in freescout-help-desk FreeScout up to 1.8.225. This issue affects an unknown part of the component Notification Payload Generation. The manipulation of the argument channel_name with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-62856 since 07/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

Upgrading to version 1.8.226 eliminates this vulnerability.

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Productinfo

Vendor

• freescout-help-desk

Name

• FreeScout

Version

• 1.8.225

Website

• Product: https://github.com/freescout-help-desk/freescout/

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