CVE-2026-4266 — WatchGuard Firebox Insecure Deserialization in Fireware Access Portal
An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to ex…
Published: 2026-03-30 · CVSS: 8.4 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7