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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://psirt.watchguard.com/CVE-2026-13046 Patch, Vendor Advisory
Vendor advisories in the News 1
- ZDI-26-749: WatchGuard FireWare OS samld SAMLSession Deserialization of Untrusted Data Remote Code Execution Vulnerability Zero Day Initiative: published advisories · 2026-09-30
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · watchguardNVD modified 2026-10-08 20:01
Affected (CPE criteria) 1
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
References 1
- https://psirt.watchguard.com/CVE-2026-13046 Patch, Vendor Advisory