Fortinet FortiWeb up to 7.4.9/7.6.4/8.0.0 SAML Response Message signature verification

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as very critical has been discovered in Fortinet FortiWeb up to 7.4.9/7.6.4/8.0.0. This vulnerability affects unknown code of the component SAML Response Message Handler. The manipulation results in signature verification. This vulnerability was named CVE-2025-59719. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Fortinet FortiWeb up to 7.4.9/7.6.4/8.0.0. Affected is an unknown functionality of the component SAML Response Message Handler. The manipulation with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at fortiguard.fortinet.com. This vulnerability is traded as CVE-2025-59719 since 09/19/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/22/2026).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-2795). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Fortinet FortiOS
  • Fortinet FortiProxy
  • Fortinet FortiSwitch
  • Fortinet FortiWeb

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (fortinet): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/19/2025 CVE reserved
12/09/2025 +81 days Advisory disclosed
12/09/2025 +0 days VulDB entry created
01/22/2026 +44 days VulDB entry last update

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-25-647
Status: Confirmed

CVE: CVE-2025-59719 (🔒)
GCVE (CVE): GCVE-0-2025-59719
GCVE (VulDB): GCVE-100-335448
CERT Bund: WID-SEC-2025-2795 - Fortinet FortiOS, FortiProxy, FortiSwitch und FortiWeb: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 12/09/2025 19:34
Updated: 01/22/2026 23:17
Changes: 12/09/2025 19:34 (64), 12/11/2025 01:43 (7), 01/22/2026 23:17 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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