Medium severity · published Jul 2, 2026
CVE-2026-13728
WatchGuard Firebox Hardcoded Fallback Encryption Key in Access Portal Resource Credential Database
4.4
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fireware OS · WatchGuard
2025.1 before 2026.2.1; 12.0 before 12.12.1; 12.0 before 12.11.9 · source: vendor
FI
Fireware · Watchguard
12.1 before 12.12.1; 2025.1 before 2026.2.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-13728
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-13728
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2026-13728
Vendor Advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00025
More from Fireware OS
9.8
CVE-2025-14733
WatchGuard Firebox iked Out of Bounds Write Vulnerability
9.8
CVE-2025-9242
WatchGuard Firebox iked Out of Bounds Write Vulnerability
9.8
CVE-2026-86131
Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code Execution
9.5
CVE-2026-103594
Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution
9.4
CVE-2026-90465
Fireware OS Missing Authentication in FireCluster Sync Allows Privilege Escalation