Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

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

Medium 6.9

In plain English

A medium-severity server-side request forgery in freescout from freescout-help-desk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 78.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
freescout-help-desk	freescout	< 1.8.211

Weakness: CWE-918 · 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

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-c9v3-4c59-x5q2 x_refsource_CONFIRM
https://github.com/freescout-help-desk/freescout/commit/ca6d5bb572d3e8f52a0e654a8623a53cb0fdd580 x_refsource_MISC
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.211 x_refsource_MISC