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CVE-2026-3987 Details
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.
A path traversal vulnerability has been identified in the Fireware OS Web UI on WatchGuard Firebox systems. This vulnerability may allow a privileged authenticated remote attacker to execute arbitrary code within the context of an elevated system process. It affects Fireware OS versions 12.6.1 prior to 12.11.8, as well as versions 2025.1 prior to 2026.1.2.
Users can upgrade to Fireware OS 12.12 or 2026.2 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CNA: WatchGuard Technologies, Inc.CVSS-B:8.6 HIGHVector: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
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 2, 2026Exploitation: NoneAutomatable: NoTechnical Impact: Total
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://psirt.watchguard.com/CVE-2026-3987 | WatchGuard Technologies, Inc. | Broken Link |
| https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009 | WatchGuard Technologies, Inc. | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | WatchGuard Technologies, Inc. |
Affected Products
| Product | Versions |
|---|---|
| watchguard fireware | >= 2025.1, < 2026.2 >= 12.6.1, < 12.12 |
CPE
Remediation
| |
| watchguard firebox m295 | All versions |
CPE
Remediation
| |
| watchguard firebox m395 | All versions |
CPE
Remediation
| |
| watchguard firebox m495 | All versions |
CPE
Remediation
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| watchguard firebox m595 | All versions |
CPE
Remediation
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| watchguard firebox m695 | All versions |
CPE
Remediation
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| watchguard firebox t115-w | All versions |
CPE
Remediation
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| watchguard firebox t125 | All versions |
CPE
Remediation
| |
| watchguard firebox t125-w | All versions |
CPE
Remediation
| |
| watchguard firebox t145 | All versions |
CPE
Remediation
| |
| watchguard firebox t145-w | All versions |
CPE
Remediation
| |
| watchguard firebox t185 | All versions |
CPE
Remediation
| |
| watchguard firebox cloud | All versions |
CPE
Remediation
| |
| watchguard firebox m270 | All versions |
CPE
Remediation
| |
| watchguard firebox m290 | All versions |
CPE
Remediation
| |
| watchguard firebox m370 | All versions |
CPE
Remediation
| |
| watchguard firebox m390 | All versions |
CPE
Remediation
| |
| watchguard firebox m440 | All versions |
CPE
Remediation
| |
| watchguard firebox m4600 | All versions |
CPE
Remediation
| |
| watchguard firebox m470 | All versions |
CPE
Remediation
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| watchguard firebox m4800 | All versions |
CPE
Remediation
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| watchguard firebox m5600 | All versions |
CPE
Remediation
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| watchguard firebox m570 | All versions |
CPE
Remediation
| |
| watchguard firebox m5800 | All versions |
CPE
Remediation
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| watchguard firebox m590 | All versions |
CPE
Remediation
| |
| watchguard firebox m670 | All versions |
CPE
Remediation
| |
| watchguard firebox m690 | All versions |
CPE
Remediation
| |
| watchguard firebox nv5 | All versions |
CPE
Remediation
| |
| watchguard firebox t20 | All versions |
CPE
Remediation
| |
| watchguard firebox t25 | All versions |
CPE
Remediation
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| watchguard firebox t40 | All versions |
CPE
Remediation
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| watchguard firebox t45 | All versions |
CPE
Remediation
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| watchguard firebox t55 | All versions |
CPE
Remediation
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| watchguard firebox t70 | All versions |
CPE
Remediation
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| watchguard firebox t80 | All versions |
CPE
Remediation
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| watchguard firebox t85 | All versions |
CPE
Remediation
| |
| watchguard fireboxv | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 14, 2026 | Initial Analysis | [email protected] |
| Aug 10, 2026 | CVE Modified | WatchGuard Technologies, Inc. |
| Jun 17, 2026 | CVE Modified | WatchGuard Technologies, Inc. |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 1, 2026 | New CVE Received | WatchGuard Technologies, Inc. |