CVE-2026-34443CWE-918

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

Medium · published March 31, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
32.8
In the wild
Unconfirmed
What it 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 record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00397 · 32.8th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-03-31T21:28Z
EPSS history
Timeline
  • 31 MAR 21:28Z
    FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()
    cvelistv5