CVE-2025-59719: Multiple Fortinet Products' FortiCloud SSO Login Authentication Bypass

Published Dec 9, 2025
·
Updated

An improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.4.9 may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

Other sources

An Improper Verification of Cryptographic Signature vulnerability[CWE-347] in FortiOS, FortiWeb, FortiProxy and FortiSwitchManager mayallow an unauthenticated attacker to bypass the FortiCloud SSO loginauthentication via a crafted SAML message, if that feature is enabled on the device. Please note that the FortiCloud SSO login feature is not enabled in default factory settings. However, when an administrator registers the device to FortiCare from the device's GUI, unless the administrator disables the toggle switch "Allow administrative login using FortiCloud SSO" in the registration page, FortiCloud SSO login is enabled upon registration. To prevent being affected by this vulnerability on vulnerableversions, please turn off the FortiCloud login feature (if enabled) temporarily untilupgrading to a non-affected version.To turn off FortiCloud login, go to System -> Settings -> Switch"Allow administrative login using FortiCloud SSO" to Off. Or type thefollowing command in the CLI: config system global set admin-forticloud-sso-login disableend

— FortiGuard

Affected Software

16 affected componentsFixes available
Fortinet FortiOS>=7.6.0<=7.6.3
Fortinet FortiOS>=7.4.0<=7.4.8
Fortinet FortiOS>=7.2.0<=7.2.11
Fortinet FortiOS>=7.0.0<=7.0.17
Fortinet FortiProxy>=7.6.0<=7.6.3
Fortinet FortiProxy>=7.4.0<=7.4.10
Fortinet FortiProxy>=7.2.0<=7.2.14
Fortinet FortiProxy>=7.0.0<=7.0.21
Fortinet FortiSwitchManager>=7.2.0<=7.2.6
Fortinet FortiSwitchManager>=7.0.0<=7.0.5
Fortinet FortiWeb=.
Fortinet FortiWeb>=7.6.0<=7.6.4
Fortinet FortiWeb>=7.4.0<=7.4.9
Fortinet FortiWeb>=7.4.0<=7.4.9
Fortinet FortiWeb>=7.6.0<=7.6.4
Fortinet FortiWeb=8.0.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade FortiOS to a version that resolves this vulnerability.

    Fixed in 7.0.18
  2. Upgrade

    Upgrade FortiOS to a version that resolves this vulnerability.

    Fixed in 7.2.12
  3. Upgrade

    Upgrade FortiOS to a version that resolves this vulnerability.

    Fixed in 7.4.9
  4. Upgrade

    Upgrade FortiOS to a version that resolves this vulnerability.

    Fixed in 7.6.4
  5. Upgrade

    Upgrade FortiPAM to a version that resolves this vulnerability.

    Fixed in 1.8.0
  6. Upgrade

    Upgrade FortiProxy to a version that resolves this vulnerability.

    Fixed in 7.0.22
  7. Upgrade

    Upgrade FortiProxy to a version that resolves this vulnerability.

    Fixed in 7.2.15
  8. Upgrade

    Upgrade FortiProxy to a version that resolves this vulnerability.

    Fixed in 7.4.11
  9. Upgrade

    Upgrade FortiProxy to a version that resolves this vulnerability.

    Fixed in 7.6.4
  10. Upgrade

    Upgrade FortiSwitchManager to a version that resolves this vulnerability.

    Fixed in 7.0.6
  11. Upgrade

    Upgrade FortiSwitchManager to a version that resolves this vulnerability.

    Fixed in 7.2.7
  12. Upgrade

    Upgrade FortiWeb to a version that resolves this vulnerability.

    Fixed in 7.4.10
  13. Upgrade

    Upgrade FortiWeb to a version that resolves this vulnerability.

    Fixed in 7.6.5
  14. Upgrade

    Upgrade FortiWeb to a version that resolves this vulnerability.

    Fixed in 8.0.1
  15. Upgrade

    Upgrade FortiSASE to a version that resolves this vulnerability.

    Fixed in 25.3.b
  16. Configuration

    To prevent being affected by the FortiCloud SSO login authentication bypass vulnerability in vulnerable versions, turn off the FortiCloud login feature (if enabled) by setting “Allow administrative login using FortiCloud SSO” to Off at System -> Settings -> Switch.

    Fortinet FortiOS (System Settings) Allow administrative login using FortiCloud SSO = Off
  17. Configuration

    Alternatively, disable the FortiCloud SSO login feature via CLI: config system global set admin-forticloud-sso-login disable.

    Fortinet FortiOS (CLI) admin-forticloud-sso-login = disable

Event History

Dec 9, 2025
Advisory Published
via FortiGuard·12:00 AM
Data Sourced
via FortiGuard·12:00 AM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:20 PM
Data Sourced
via MITRE·05:20 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·06:15 PM
DescriptionSeverityWeaknessAffected Software
News Published
via BleepingComputer·06:36 PM
News Published
via The Register·11:42 PM
News Published
via The Register·11:44 PM
Dec 10, 2025
News Published
via BleepingComputer·06:39 PM
Dec 16, 2025
News Published
via BleepingComputer·03:57 PM
Dec 19, 2025
News Published
via BleepingComputer·03:00 PM
Jan 22, 2026
News Published
via BleepingComputer·11:49 AM
News Published
via The Register·04:07 PM
Jan 28, 2026
News Published
via The Register·04:30 PM
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Frequently Asked Questions

1

What is the severity of CVE-2025-59719?

The severity of CVE-2025-59719 has not been explicitly rated, but it involves an improper verification of cryptographic signatures, which can lead to serious security issues.

2

How do I fix CVE-2025-59719?

To fix CVE-2025-59719, update affected FortiOS, FortiProxy, FortiWeb, or FortiSwitchManager to the latest patched version as specified by Fortinet.

3

Which Fortinet products are affected by CVE-2025-59719?

CVE-2025-59719 affects FortiOS, FortiProxy, FortiWeb, and FortiSwitchManager versions specified within certain ranges.

4

Can CVE-2025-59719 be exploited remotely?

Yes, an unauthenticated attacker can exploit CVE-2025-59719 remotely through a crafted SAML message.

5

What does CVE-2025-59719 allow an attacker to do?

CVE-2025-59719 allows an attacker to bypass FortiCloud SSO login authentication when the feature is enabled on the affected devices.

Company

Resources

Contact

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