9.8

CVE-2025-59719: Fortinet Fortiweb

CVSS: 9.8v3.1CriticalKEVModified
Published 09-12-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-59719 is a critical (CVSS 9.8) vulnerability in Fortinet Fortiweb. It is known to be exploited: ENISA lists it, first on 27-01-2026. EPSS estimates a 29.22% chance of exploitation in the next 30 days, higher than 98.1% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
29.22%
0%100%
High · 0.00 pp in 30 days
KEVListedENISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-12-2025
    PublishedVulnerability first disclosed.
  2. 27-01-2026
    Added to ENISA KEVAdded to the ENISA known exploited vulnerabilities catalog.
  3. 15-10-2026
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

29.22%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

0.00 pp

From 29.22% on 22-09-2026

22-09-202622-10-2026
EPSS score
29.22%

Known exploited

Compare KEV catalogs
ENISA CNWListed
Added
27-01-2026

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet1 product
  • fortiweb8.0.0 | ≥ 7.6.0, ≤ 7.6.4 | ≥ 7.4.0, ≤ 7.4.9

1 vendor · 1 product

References

2 links