CVE-2026-13728: WatchGuard Fireware

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

In exception circumstances, WatchGuard Fireware OS on a FireCluster may use a hard-coded encryption key to encrypt saved credentials for Access Portal resources. This vulnerability does not affect devices that do not support the Access Portal feature or standalone Fireboxes not deployed in a FireCluster.

Affected products

• WatchGuard Fireware: from 12.1, before 12.12.1 (fixed in 12.12.1); from 2025.1, before 2026.2.1 (fixed in 2026.2.1)

Published 2026-07-03. Last modified 2026-08-28.