CVE-2026-13046

High

Description

A deserialization of untrusted data vulnerability in WatchGuard Fireware OS's SAML single sign-on session handling (samld) allows an attacker who has already obtained the ability to write files on the appliance to execute arbitrary code in the context of the samld service by causing samld to load a maliciously crafted session file.

SeverityHigh

CVSS7.2

Exploit probability—

ProductWatchguard Fireware

PublishedSep 30, 2026

First seenSep 30, 2026

Weakness typeCWE-502Deserialization of untrusted data

How to fix

Update

watchguard fireware12.11.10, 12.12.3, 2026.2.3, 2026.3.2 or later

Vendor advisories

psirt.watchguard.com/CVE-2026-13046

Affected products

Product	Affected versions	Fixed in
watchguard fireware	12.0 ≤ v < 12.11.10, 12.12 ≤ v < 12.12.3, 2025.0 ≤ v < 2026.2.3, 2026.3 ≤ v < 2026.3.2	12.11.10, 12.12.3, 2026.2.3, 2026.3.2

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