Improper Authorization Vulnerability in WatchGuard Fireware OS
CVE-2026-86101

7.2HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
29 September 2026

Badges

👾 Exploit Exists

What is CVE-2026-86101?

An improper authorization flaw in the SAML login process of WatchGuard Fireware OS allows remote, authenticated users who are limited to the Access Portal to gain unauthorized access to Mobile VPN with SSL. This vulnerability can be exploited through a specially crafted request, potentially compromising secure access configurations and allowing unauthorized network infiltration.

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-2026-86101
vendor-advisory

CVSS V4

Score:
7.2
Severity:
HIGH
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

Laurent GAFFIE , secorizon.com
.