What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-918

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

• freescout-help-desk freescout: before 1.8.211 — fixed in 1.8.211

How to fix

Upgrade to a fixed version: freescout-help-desk freescout 1.8.211. Check the vendor advisory for mitigations.

References

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

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