Description
A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.
Affected products
watchguard: fireware; watchguard: firebox m295; watchguard: firebox m395; watchguard: firebox m495; watchguard: firebox m595; watchguard: firebox m695; watchguard: firebox t115-w; watchguard: firebox t125; watchguard: firebox t125-w; watchguard: firebox t145; watchguard: firebox t145-w; watchguard: firebox t185; watchguard: firebox cloud; watchguard: firebox m270; watchguard: firebox m290
References2
- www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009 Vendor Advisory
- psirt.watchguard.com/CVE-2026-3987 Broken Link
Metrics
- CVSS 3.1
-
7.2
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
8.6
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/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 - EPSS — exploit probability
- 1% percentile: 53 · as of 12 November 2026
- CWE
- CWE-22
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.