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CVE-2025-59719

Published: Dec 9, 2025Updated: Jun 9, 2026 Sources: CVE List NVD BDU csafCWE-347
9.8CRITICAL
NVD MITRE
EPSS Score
25.0%
Top 2.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

In plain language

AI Act now

CVE-2025-59719 is a Fortinet FortiWeb SSO weakness that lets an outsider forge a SAML login and impersonate a user, and it has been exploited in the wild—so if you run the affected Fortinet products, you should treat this as urgent.

Executive summary

CVE-2025-59719 enables unauthenticated SAML authentication bypass in Fortinet FortiWeb (via improper cryptographic signature verification), allowing attackers to forge/alter SAML responses to impersonate authenticated users.

If affected, business impact
Account takeover via SSOUnauthorized access to systemsService disruptionWider breach risk

What to do now

  1. Check whether you are running Fortinet FortiWeb version 8.0.0 or 7.6.0–7.6.4 or 7.4.0–7.4.9, and whether FortiCloud SSO login is enabled and configured.
  2. If you are affected, plan an immediate upgrade to a fixed FortiProxy / FortiSwitchManager / FortiWeb version as provided by Fortinet PSIRT (FG-IR-25-647).
  3. Contact your Fortinet support channel (or your vendor/managed service provider) to confirm the exact FortiWeb fixed versions for your environment and complete the secure update procedure.
  4. Until upgraded, review exposure: restrict network access to SSO/SSO-related endpoints and block internet access where possible, then monitor for suspicious SSO/SSO-auth events related to FortiCloud SSO.
Patch / advisory Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-347

Affected Products

Fortinet Inc.
commercial·USaka fortinet
FortiOS
Security Products
FortiProxy
Security Products
FortiSwitchManager
Security Products
FortiWeb
Security Products
Fortinet
commercial·USaka forti net
FortiWeb
Security Products
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2025-59719?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-647
fortiguard.fortinet.com
https://cert-portal.siemens.com/productcert/csaf/ssa-864900.json
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-864900.html
cert-portal.siemens.com
and 67 more references View all →
News mentions
5

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