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CVE PROGRAM SOURCE RECORD8.4 High

CVE-2026-4266

WatchGuard Firebox Insecure Deserialization in Fireware Access Portal

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Status
Published
Published
Updated
Assigning organization
WatchGuard

Description

An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user. Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

WatchGuard Fireware OS

Default version status: unaffected

  • 2025.1 to < 2026.2affected
  • 12.1 to < 12.12affected

WatchGuard Fireware OS

Default version status: unaffected

  • 12.1 to < 12.11.9affected

References