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OpenAdvisories
Medium · 6.9 CVE-2026-34443 EUVD-2026-17674

FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()

Published Mar 31, 2026 · Updated Apr 1, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
freescout-help-desk freescout < 1.8.211 —

References