Path Traversal Vulnerability in Fireware OS Web UI on WatchGuard Firebox Systems
CVE-2026-3987

8.6HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
1 April 2026

Badges

👾 Exploit Exists

What is CVE-2026-3987?

A path traversal vulnerability exists within the Web UI of Fireware OS on WatchGuard Firebox systems that allows a privileged authenticated remote attacker to execute arbitrary code. This vulnerability is present in versions ranging from 12.6.1 to 12.11.8 and 2025.1 to 2026.1.2, potentially leading to elevated privileges within the system process.

Affected Version(s)

Fireware OS 12.6.1 <= 12.11.8

Fireware OS 2025.1 <= 2026.1.2

References

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-...

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

btaol
.