WatchGuard Fireware OS up to 12.12/2026.2 Access Portal Feature hard-coded credentials

Summaryinfo

A vulnerability was found in WatchGuard Fireware OS up to 12.12/2026.2. It has been rated as critical. The affected element is an unknown function of the component Access Portal Feature. The manipulation leads to hard-coded credentials. This vulnerability is traded as CVE-2026-13728. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in WatchGuard Fireware OS up to 12.12/2026.2. It has been rated as critical. This issue affects an unknown function of the component Access Portal Feature. The manipulation with an unknown input leads to a hard-coded credentials vulnerability. Using CWE to declare the problem leads to CWE-798. The product contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data. Impacted is confidentiality. The summary by CVE is:

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 affects Fireware OS 12.1 up to and including 12.12 and 2025.1 up to and including 2026.2. This vulnerability does not affect devices that do not support the Access Portal feature or standalone Fireboxes not deployed in a FireCluster.

The weakness was shared by Cody Sixteen as wgsa-2026-00025. It is possible to read the advisory at watchguard.com. The identification of this vulnerability is CVE-2026-13728 since 06/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/03/2026). The attack technique deployed by this issue is T1110.001 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• WatchGuard

Name

• Fireware OS

Version

• 12.0
• 12.1
• 12.2
• 12.3
• 12.4
• 12.5
• 12.6
• 12.7
• 12.8
• 12.9
• 12.10
• 12.11
• 12.12
• 2026.0
• 2026.1
• 2026.2

License

• commercial

CPE 2.3info

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CPE 2.2info

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• 🔒
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