What is CVE-2025-59719?

CVE-2025-59719 is a critical-severity vulnerability in Fortinet Fortiweb, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2025-12-09.

How severe is CVE-2025-59719?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Fortinet Fortiweb

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 unauthenticated attacker to bypass the FortiCloud SSO login authenticatio…

EPSS: 0.003 (49.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: 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.

Affected products

Fortinet Fortiweb — versions 8.0.0, 7.6.0, 7.4.0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-647

Frequently asked questions

What is CVE-2025-59719?: CVE-2025-59719 is a critical-severity vulnerability in Fortinet Fortiweb, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2025-12-09.
How severe is CVE-2025-59719?: Critical severity. CVSS v3 base score is 9.1 out of 10.