Unauthenticated administrative access via crafted SAML response
Published Dec 9, 2025 · Updated Aug 11, 2026
Authentication bypass in FortiOS, FortiProxy, and FortiSwitch Manager allows remote attackers to obtain administrative access. The FortiCloud SSO handler accepts a crafted SAML response despite improper verification of its cryptographic signature, treating the assertion as a valid administrative login. Exploitation requires FortiCloud SSO to be enabled; factory settings disable it, but GUI-based FortiCare registration enables it unless an administrator opts out, and observed intrusions exported device configurations.
Summary
What happened
Authentication bypass in FortiOS, FortiProxy, and FortiSwitch Manager allows remote attackers to obtain administrative access. The FortiCloud SSO handler accepts a crafted SAML response despite improper verification of its cryptographic signature, treating the assertion as a valid administrative login. Exploitation requires FortiCloud SSO to be enabled; factory settings disable it, but GUI-based FortiCare registration enables it unless an administrator opts out, and observed intrusions exported device configurations.
The record
- CVE
- CVE-2025-59718
- Published
- Dec 9, 2025
- Updated
- Aug 11, 2026
- Vendor
- Siemens
- Product
- RUGGEDCOM APE1808
- Classifications
- CWE-347, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Dec 12, 2025Exploitation reportedMalicious FortiCloud SSO logins against FortiGate appliances
- Aug 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- Malicious FortiCloud SSO logins against FortiGate appliancesreported exploitation
Technologies
Your stack
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Your stack
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