CVE-2026-86101Network attack vector

Unauthorized SSL VPN access via SAML authorization bypass

Published Sep 29, 2026 · Updated Sep 29, 2026

Improper authorization in WatchGuard Fireware OS allows remote authenticated users to gain unauthorized Mobile VPN with SSL access. The SAML login process accepts a specially crafted request from an Access Portal-only user without enforcing the separate SSL VPN authorization boundary. Exploitation requires valid SAML credentials and Access Portal access; the reported consequence is unauthorized VPN connectivity, not device administration.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in WatchGuard Fireware OS allows remote authenticated users to gain unauthorized Mobile VPN with SSL access. The SAML login process accepts a specially crafted request from an Access Portal-only user without enforcing the separate SSL VPN authorization boundary. Exploitation requires valid SAML credentials and Access Portal access; the reported consequence is unauthorized VPN connectivity, not device administration.

The record

CVE
CVE-2026-86101
Published
Sep 29, 2026
Updated
Sep 29, 2026
Vendor
WatchGuard Technologies, Inc.
Product
Fireware OS
Classifications
T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.0 <12.12.3
  2. Affected versionversion=12.0 <12.5.21
  3. Affected versionversion=2025.0 <2026.2.3
  4. Affected versionversion=2026.3 <2026.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WatchGuard Technologies, Inc. · Fireware OSversion=12.0 <12.12.3; version=12.0 <12.5.21; version=2025.0 <2026.2.3; version=2026.3 <2026.3.2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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