CVE-2025-59718Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

9.8 CRITICALEPSS 68.29%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-10-15 01:09 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: fortinet (CNA)
NVD status: Analyzed
Published: Dec 9, 2025
Assigner: fortinet

Affected

FortiSwitchManager (Fortinet)

Versions: 7.2.0 through 7.2.6 · 7.0.0 through 7.0.5

+2 more products →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Dec 16, 2025
KEV due date: Dec 23, 2025
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

68.29%chance of exploitation in 30 days

Higher than 99.33% of CVEs

CVSS 3.1 · fortinet (CNA)

9.8Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · fortinet (CNA)

9.1Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1fortinet (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.1	CRITICAL	3.1fortinet (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CISA required action

⚡ Known exploited · remediation due Dec 23, 2025

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Details

CVE ID: CVE-2025-59718
Status: Analyzed
Assigner (CNA): fortinet
Published: Dec 9, 2025
Last modified: 2026-10-15 01:09 UTC
Weaknesses: CWE-347 · Improper access control

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 10:34 UTC.