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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
CVE-2025-14733

WatchGuard Firebox iked Out of Bounds Write Vulnerability

An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN using IKEv2 when configured with a dynamic gateway peer. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured.

CVSS 4.0 · 9.3 Critical EPSS 29.4% KEV · Listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13053

WatchGuard Firebox Authenticated Out of Bounds Write in Management CLI Command Handler

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS's CLI could allow an authenticated privileged user to execute arbitrary code via a specially crafted CLI command.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13054

WatchGuard Firebox Arbitrary File Write via Path Traversal in Management Web UI

A path traversal vulnerability in the WatchGuard Fireware OS Management Web UI allows a privileged authenticated attacker to write arbitrary files on the Firebox's filesystem.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13079

WatchGuard Mobile VPN with SSL Windows Client Local Privilege Escalation

A local privilege escalation vulnerability in the WatchGuard Mobile VPN with SSL client for Windows allows a local attacker to escalate their privileges to NT AUTHORITY\SYSTEM on the machine where the client is installed. This issue affects the Mobile VPN with SSL client for Windows up to and including 2026.2.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 39 more
CVE-2026-13728

WatchGuard Firebox Hardcoded Fallback Encryption Key in Access Portal Resource Credential Database

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 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 35 more
CVE-2026-13384

WatchGuard Firebox wgagent Out of Bounds Write Vulnerability

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS wgagent 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 M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13383

WatchGuard Firebox ikestubd Out of Bounds Write Vulnerability

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS ikestubd 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 M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13377

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS SIP Proxy module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-6947.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13376

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in spamBlocker Module

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS spamBlocker module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-1071. This issue affects Fireware OS 12.0 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13373

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in Tigerpaw Technology Integration Configuration

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (Tigerpaw Technology Integration module) allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-13936.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more
CVE-2026-13374

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in ConnectWise Technology Integration Configuration

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (ConnectWise Technology Integration module) allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-13937.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Watchguard
Products
Firebox M270 Firebox M290 Firebox M295 and 37 more