Medium severity · published Mar 31, 2026
CVE-2026-34443
FreeScout: SSRF protection bypass via broken CIDR check in checkIpByMask()
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
freescout · freescout-help-desk
< 1.8.211 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34443
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34443
Patch
https://github.com/freescout-help-desk/freescout/commit/ca6d5bb572d3e8f52a0e654a8623a53cb0fdd580
Release Notes
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.211
Exploit
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-c9v3-4c59-x5q2
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