Is CVE-2026-86105 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-86105 being exploited in the wild.

How severe is CVE-2026-86105?

Informational severity, published 30 September 2026.

Which products and versions are affected?

Watchguard Fireware OS 2026.3.x before 2026.3.2; 2026.2.x before 2026.2.3; 2025.0.x; 12.x before 12.12.3; 12.5.x before 12.5.21 (T15/T35 models).

Is there a fix for CVE-2026-86105?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-86105 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-86105?

Check whether you run Watchguard Fireware OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-86105: WatchGuard Fireware OS improper authorization in Access Portal reverse proxy

CVE-2026-86105 · Severity: info · Published 2026-09-30

WatchGuard Fireware OS includes an Access Portal reverse proxy component that controls user access to web applications. An authenticated user with limited permissions can craft a specially designed request to bypass access controls and reach web applications they should not be authorized to use, potentially exposing sensitive data or gaining unauthorized system access.

Technologies: Watchguard Fireware OS. Vendors: Watchguard.

Quick answers

Is CVE-2026-86105 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-86105 being exploited in the wild.
How severe is CVE-2026-86105?: Informational severity, published 30 September 2026.
Which products and versions are affected?: Watchguard Fireware OS 2026.3.x before 2026.3.2; 2026.2.x before 2026.2.3; 2025.0.x; 12.x before 12.12.3; 12.5.x before 12.5.21 (T15/T35 models).
Is there a fix for CVE-2026-86105?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-86105 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-86105?: Check whether you run Watchguard Fireware OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An improper authorization vulnerability in the Access Portal reverse proxy allows authenticated low-privileged users to access unauthorized web applications by sending specially crafted requests leveraging path traversal or URL encoding bypasses. The vulnerability involves improper pathname handling and authorization checks (CWE-22, CWE-285). Exploitation requires user authentication and network access to the Access Portal; patched versions are available.

Affected products

WatchGuard Fireware OS 2026.3.x before 2026.3.2; 2026.2.x before 2026.2.3; 2025.0.x; 12.x before 12.12.3; 12.5.x before 12.5.21 (T15/T35 models)

Timeline

2026-09-29: disclosed

References

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

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