PT-2026-29022 · Watchguard · Firebox T-35+2

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CVE-2026-4266

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Published

2026-03-30

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Updated

2026-08-14

CVSS v4.0

8.4

High

VectorAV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Name of the Vulnerable Software and Affected Versions WatchGuard Fireware OS versions 12.1 through 12.11.8 WatchGuard Fireware OS versions 2025.1 through 2026.1.2
Description An insecure deserialization issue allows an attacker who has already obtained write access to the local filesystem via a separate vulnerability to execute arbitrary code. The execution occurs within the context of the portald user. This issue only affects platforms that support the Access Portal feature.
Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Deserialization of Untrusted Data

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Weakness Enumeration

Related Identifiers

CVE-2026-4266

Affected Products

Firebox T-15
Firebox T-35
Watchguard Fireware