Improper Authorization in WatchGuard Fireware OS Access Portal
CVE-2026-86105

5.3MEDIUM

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
29 September 2026

Badges

👾 Exploit Exists

What is CVE-2026-86105?

An improper authorization flaw in WatchGuard Fireware OS's Access Portal reverse proxy can enable an authenticated, low-privileged user to gain unauthorized access to restricted web applications. By crafting a specific request targeting a different resource, a user can exploit this vulnerability, potentially leading to data exposure and access violations. It's critical for organizations using this system to review their configurations and implement necessary mitigations.

Affected Version(s)

Fireware OS Default 2026.3 < 2026.3.2

Fireware OS Default 2025.0 < 2026.2.3

Fireware OS Default 12.0 < 12.12.3

References

https://psirt.watchguard.com/CVE-2026-86105
vendor-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WatchGuard AI Security Research
Laurent GAFFIE , secorizon.com
.