CVE-2026-86101 PUBLISHED

Fireware OS Authorization Bypass in SAML Login Allows Unauthorized SSLVPN Access

Assigner: WatchGuard
Reserved: 04.09.2026 Published: 29.09.2026 Updated: 30.09.2026

An improper authorization vulnerability in WatchGuard Fireware OS's SAML login process allows a remote, authenticated SAML user with access only to the Access Portal to obtain unauthorized Mobile VPN with SSL access through a specially crafted request.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:H/SA:N
CVSS Score: 7.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	Low	Integrity	High
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 2026.3 to 2026.3.2 (excl.) affected from 2025.0 to 2026.2.3 (excl.) affected from 12.0 to 12.12.3 (excl.)

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 12.0 to 12.5.21 (excl.)

Exploits

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solutions

Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3, Fireware OS 12.5.21

Credits

Laurent GAFFIE , secorizon.com finder

References

https://psirt.watchguard.com/CVE-2026-86101

Problem Types

CWE-285 CWE
CWE-863 CWE