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CVE-2026-34442

FreeScout: Host Header Injection Leading to External Resource Loading and Open Redirect in FreeScout

Published: Mar 31, 2026Updated: Apr 1, 2026 Sources: CVE List NVDCWE-20
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 87.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.211, host header manipulation in FreeScout version (http://localhost:8080/system/status) allows an attacker to inject an arbitrary domain into generated absolute URLs. This leads to External Resource Loading and Open Redirect behavior. When the application constructs links and assets using the unvalidated Host header, user requests can be redirected to attacker-controlled domains and external resources may be loaded from malicious servers. This issue has been patched in version 1.8.211.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-20CWE-601CWE-829

Affected Products

freescoutfreescout-help-desk
On-premWeb App
Enterprise Software / itsm-monitoring
freescoutfreescout
Mixed
Enterprise Software / itsm-monitoring
freescout-help-deskcommercialEnterprise Software
freescoutcommercialEnterprise Softwareaka freescout

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Initial Access
View detailed technique mapping

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-822g-7rw5-53xj
github.com
https://github.com/freescout-help-desk/freescout/commit/889d75c8e3c15e6a7ddb6a4d4f65cc0379c29213
github.com
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.211
github.com

Timeline

Published
Mar 31, 2026
Last Updated
Apr 1, 2026

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