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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 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.

CVSS 4.0 · 8.4 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 35 more
CVE-2026-4315

WatchGuard Firebox Cross-Site Request Forgery (CSRF) in Fireware Web UI

A Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote attacker to trigger a denial-of-service (DoS) condition in the Fireware Web UI by convincing an authenticated administrator into visiting a malicious web page.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more
CVE-2026-3987

WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI

A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 35 more
CVE-2026-13050

WatchGuard Firebox networkd Out of Bounds Write Vulnerability

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS networkd process could allow an authenticated privileged user to execute arbitrary code via a specially crafted requests to the Management Web UI.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more
CVE-2026-13084

Null Pointer Dereference in WatchGuard Fireware OS iked Process

A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to create a denial-of-service (DoS) condition by sending specially crafted IKEv2 messages. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer. This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more
CVE-2026-13368

WatchGuard Firebox Race Condition and Use-After-Free in Mobile VPN with IKEv2 LDAP Authentication

WatchGuard Fireware OS contains a race condition leading to a use-after-free vulnerability in LDAP authentication for the Mobile User VPN with IKEv2. A remote unauthenticated attacker could exploit this vulnerability to execute arbitrary code in the context of the iked process on Fireboxes that have a Mobile VPN with IKEv2 configured to use an external LDAP authentication server.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more
CVE-2026-13371

WatchGuard Firebox Management Web UI Denial of Service via Unsafe Deserialization

An authenticated administrator can trigger a denial-of-service condition in the Fireware Management Web UI by sending malformed or crafted data to the put_data endpoint, which performs unsafe deserialization of the attacker-supplied input.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more
CVE-2026-13722

WatchGuard Firebox Firmware Image Validation Bypass in WatchGuard Fireware OS

WatchGuard Fireware OS contains a firmware validation bypass when processing a backup image via the backup/restore feature. An authenticated administrator can exploit this vulnerability to install a tampered firmware image.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more
CVE-2026-8247

WatchGuard Firebox admd Out of Bounds Write Vulnerability

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox Cloud Firebox M270 Firebox M290 and 37 more