CVE-2025-59719 Auth bypass in FortiWeb

What is CVE-2025-59719?

CVE-2025-59719 is a critical authentication bypass vulnerability in Fortinet Fortiweb, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-347

Which versions are affected by CVE-2025-59719?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2025-59719?

No fix has been published for CVE-2025-59719 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-59719 being exploited?

There is no known exploitation of CVE-2025-59719 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortiweb

• CVE-2025-25257 Fortinet FortiWeb SQL Injection Exploited Critical 9.6
• CVE-2025-64446 Fortinet FortiWeb Path Traversal Exploited Critical 9.4
• CVE-2025-58034 Fortinet FortiWeb OS Command Injection Exploited Medium 6.7
• CVE-2020-29015 SQL injection in Fortinet FortiWeb Critical 9.8
• CVE-2020-29016 Memory corruption in Fortinet FortiWeb Critical 9.8

All Fortinet Fortiweb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-chq4-235q-jp7w.