Critical severity · published Dec 9, 2025
CVE-2025-59719
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…
9.8
CVSS
29.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)29.2% · higher than 98% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
FortiWeb · Fortinet
8.0.0; 7.6.0 through 7.6.4; 7.4.0 through 7.4.9 · source: vendor, NVD
RA
RUGGEDCOM APE1808 · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59719
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59719
Vendor Advisory
https://fortiguard.fortinet.com/psirt/FG-IR-25-647
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-864900.html
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