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CVE-2026-86136

Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant A

HIGH
8.1
CVSS Score
Published: September 29, 2026 at 11:05 PM UTC
Updated: October 6, 2026 at 08:22 PM UTC
1 product affected across 1 vendorFireware

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Severity
HIGH8.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fireware· WatchGuard
95%
12.0 ≤ v < 12.12.312.0 ≤ v < 12.5.2112.12 ≤ v < 12.12.32025.0 ≤ v < 2026.2.32026.0 ≤ v < 2026.3.22026.3 ≤ v < 2026.3.212.02025.02026.0
Affected range stops below 12.12.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.2.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.3.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://psirt.watchguard.com/CVE-2026-86136

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-22CWE-476CWE-862

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