CVE-2026-4266
Medium · 6.7CVSS
6.7
EPSS
0.4%
Published
Mar 30, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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