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CVE-2026-86136

Watchguard Fireware path traversal

8.1 HIGHEPSS 0.30%
  1. Published29 Sept 2026

Description

A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

Watchguard Fireware≥ 12.0 < 12.5.21 · ≥ 12.12 < 12.12.3 · ≥ 2025.0 < 2026.2.3 · ≥ 2026.3 < 2026.3.2

Remediation

Fixed in
Watchguard Fireware≥ 12.5.21

References

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Frequently asked

Is CVE-2026-86136 being actively exploited?

CVE-2026-86136 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.30%.

How severe is CVE-2026-86136?

CVE-2026-86136 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2026-86136?

Affected products include Watchguard Fireware.

How do I fix CVE-2026-86136?

Upgrade affected software to a fixed version, for example Watchguard Fireware 12.5.21 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-86136 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.