CVE-2026-13046
Received Received - Intake

WatchGuard Fireware OS SAML Session Deserialization RCE

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: WatchGuard Technologies, Inc.

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.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-13046
EUVD
EUVD-2026-89498

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
watchguard fireware_os to 2026.3.2 (exc)
watchguard fireware_os to 2026.2.3 (exc)
watchguard fireware_os to 12.12.3 (exc)
watchguard eucc to 12.11.10 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

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Executive Summary

This vulnerability is a deserialization of untrusted data flaw in WatchGuard Fireware OS's SAML single sign-on session handling component (samld). It allows an attacker with file write access to execute arbitrary code by tricking samld into loading a malicious session file.

Detection Guidance

To detect this vulnerability, check if your WatchGuard Fireware OS version is below 2026.3.2, 2026.2.3, 12.12.3, or EUCC versions below 12.11.10. Review logs for unauthorized file writes or suspicious samld service activity.

Impact Analysis

If exploited, this vulnerability could allow an attacker to run malicious code on your WatchGuard appliance with the privileges of the samld service. This could lead to unauthorized access, data theft, or further compromise of your network.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations must address it to maintain data protection and security standards.

Mitigation Strategies

Immediately update Fireware OS to versions 2026.3.2, 2026.2.3, 12.12.3, or EUCC to 12.11.10 or later. Restrict file write permissions on the appliance to prevent unauthorized file creation.

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