freescout-help-desk freescout up to 1.8.210 app/Misc/Helper.php checkIpByMask server-side request forgery

Summaryinfo

A vulnerability identified as critical has been detected in freescout-help-desk freescout up to 1.8.210. This issue affects the function checkIpByMask of the file app/Misc/Helper.php. The manipulation leads to server-side request forgery. This vulnerability is referenced as CVE-2026-34443. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in freescout-help-desk freescout up to 1.8.210. It has been rated as critical. This issue affects the function checkIpByMask of the file app/Misc/Helper.php. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.211, checkIpByMask() in app/Misc/Helper.php checks whether the input IP contains a / character. Plain IP addresses never contain /, so the function always returns false without checking any CIDR ranges. The entire 10.0.0.0/8 and 172.16.0.0/12 private ranges are unprotected. This issue has been patched in version 1.8.211.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-34443 since 03/27/2026. 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.

By approaching the search of inurl:app/Misc/Helper.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.8.211 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch ca6d5bb572d3e8f52a0e654a8623a53cb0fdd580 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• freescout-help-desk

Name

• freescout

Version

• 1.8.210

License

• open-source

Website

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

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion