CVE-2026-34443 FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()

Medium 6.9 Published 31 Mar 2026 Updated 1 Apr 2026

Attackers can bypass SSRF protections in FreeScout to access internal private network resources due to a broken IP validation check.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-34443?

CVE-2026-34443 is a medium-severity server-side request forgery vulnerability in freescout-help-desk freescout, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-918

Which versions are affected by CVE-2026-34443?

It affects 1 product.

Products include Freescout Freescout.

How do I fix CVE-2026-34443?

No fix has been published for CVE-2026-34443 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-34443 being exploited?

There is no known exploitation of CVE-2026-34443 in the wild and no public exploit code.

Sources

Also known as GHSA-c9v3-4c59-x5q2.