CVE-2026-90464 WatchGuard Fireware OS - Path Traversal

WatchGuard Fireware OS firewall contains an external control of file path vulnerability in diagnostic command, letting remote authenticated attackers with read-only Device Monitor privileges create or overwrite files and modify kernel parameters with root privileges, exploit requires management CLI access.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write, Privilege Escalation
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
27 October 2026
Updated
29 October 2026
Weakness
CWE-59

Vendor fix

Update to the latest Fireware OS version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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