High [CVE-2026-86101] 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
This high-severity WatchGuard advisory covers CVE-2026-86101 affecting Fireware OS.
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Summary
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.
- Fireware OS 2026.3 before 2026.3.2
- Fireware OS 2025.0 before 2026.2.3
- Fireware OS 12.0 before 12.12.3
- Fireware OS 12.0 before 12.5.21
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
- 2026.3.2
- 2026.2.3
- 12.12.3
- 12.5.21
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.3.2, 2026.2.3, 12.12.3, 12.5.21. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
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