How severe is CVE-2025-59719?

CVE-2025-59719 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-59719 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59719?

CVE-2025-59719 primarily affects Fortinet Fortiweb. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-59719?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-59719 have an EU (EUVD) identifier?

Yes. CVE-2025-59719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202191. It is also flagged as exploited in the EUVD (since 2026-01-27).

When was CVE-2025-59719 published?

CVE-2025-59719 was published on 2025-12-09 and last updated on 2026-06-17.

CVE-2025-59719

CVE-2025-59719 is a critical-severity vulnerability in Fortinet Fortiweb with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 24% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-347.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 24% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202191
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-01-27)
Weakness: CWE-347
Affected product: Fortinet Fortiweb
Published: 2025-12-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 authentication via a crafted SAML response message.
How severe is CVE-2025-59719?: CVE-2025-59719 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-59719 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59719?: CVE-2025-59719 primarily affects Fortinet Fortiweb. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-59719?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-59719 have an EU (EUVD) identifier?: Yes. CVE-2025-59719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202191. It is also flagged as exploited in the EUVD (since 2026-01-27).
When was CVE-2025-59719 published?: CVE-2025-59719 was published on 2025-12-09 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:8.0.0:*:*:*:*:*:*:*

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