CVE-2025-59719Fortiweb Vulnerability
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.
Published Dec 10, 2025 · Updated Oct 15, 2026
Key Facts
Patch immediately- CVE-2025-59719 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Fortiweb (Fortinet).
- It is exploited in the wild, listed in CIRCL KEV, ENISA EUVD, Industry KEV feed since Dec 15, 2025. No public exploit code is known.
- EPSS estimates a 29% probability of exploitation in the next 30 days.
- Fixed versions are available, including Fortiweb <=7.4.9, Fortiweb 7.4.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
29%
Higher than 98.1% of all scored CVEs
Exploit maturity
None known
ATLAS score
41/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Dec 15, 2025
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
None known
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
10
Reports of active use
Advisories And Exploit References
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | Dec 15, 2025 | n/a | Not reported |
| ENISA EUVD | Dec 15, 2025 | n/a | Not reported |
| Industry KEV feed | Dec 15, 2025 | n/a | Not reported |
Affected Products
17 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiwebFortinet | 7.4.0, 7.4.1, 7.4.2, 7.4.3, 7.4.4, 7.4.5, 7.4.6, 7.4.7 | 7.4.9 |
Patched Releases
Fortiweb
<=7.4.9
Timeline
Publicly disclosed
Dec 10, 2025
Added to CIRCL KEV
Dec 15, 2025
Added to ENISA EUVD
Dec 15, 2025
Added to Industry KEV feed
Dec 15, 2025
Last updated
Oct 15, 2026
Weakness Type
- CWE-347 Improper Verification of Cryptographic Signature
References
- advisorynvd.nist.gov · CVE-2025-59719
- advisoryhttps://fortiguard.fortinet.com/psirt/FG-IR-25-647
- advisoryUSOM advisory
- advisorynvd.nist.gov · CVE-2025-59718
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Fortiweb (Fortinet) versions 7.4.0, 7.4.1, 7.4.2, 7.4.3, 7.4.4, 7.4.5, 7.4.6, 7.4.7. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, ENISA EUVD, Industry KEV feed since Dec 15, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Fortiweb <=7.4.9, Fortiweb 7.4.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2025-59719 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
Request A Demo