CVE-2025-59719
Fortinet FortiWeb Cryptographic Signature Verification Bypass Vulnerability
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.
INFO
Published Date :
Dec. 9, 2025, 6:15 p.m.
Last Modified :
Dec. 9, 2025, 7:59 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 6abe59d8-c742-4dff-8ce8-9b0ca1073da8 | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update FortiWeb to a patched version.
- Verify SAML response integrity.
- Ensure proper SSO configuration.
Public PoC/Exploit Available at Github
CVE-2025-59719 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-59719.
| URL | Resource |
|---|---|
| https://fortiguard.fortinet.com/psirt/FG-IR-25-647 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-59719 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-59719
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
PoC para determinar si Fortinet es vulnerable a CVE-2025-59718 / CVE-2025-59719
Python
Fortinet announced two closely related authentication‑bypass vulnerabilities on 9 December 2025. Both flaws involve improper verification of cryptographic signatures (CWE‑347) in the handling of SAML responses for the FortiCloud SSO login feature.
Python
parse SAML responses from a pcap
Python
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-59719 vulnerability anywhere in the article.
-
CybersecurityNews
Cybersecurity Weekly Recap – PornHub Breach, Cisco 0-Day, Amazon Detains DPRK IT Worker, and more
In a week that revealed the flaws in digital trust, cybersecurity headlines were filled with high-profile breaches, zero-day exploits, and bold nation-state espionage. Attackers claimed to have swiped ... Read more
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CybersecurityNews
25,000+ FortiCloud SSO-Enabled Devices Exposed to Remote Attacks
Over 25,000 Fortinet devices worldwide with FortiCloud Single Sign-On (SSO) enabled, leaving them potentially exposed to remote attacks. The finding stems from enhanced device fingerprinting in a new ... Read more
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BleepingComputer
Over 25,000 FortiCloud SSO devices exposed to remote attacks
Internet security watchdog Shadowserver has found over 25,000 Fortinet devices exposed online with FortiCloud SSO enabled, amid ongoing attacks targeting a critical authentication bypass vulnerability ... Read more
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security.nl
25.000 Fortinet-apparaten met FortiCloud SSO toegankelijk vanaf internet
Zeker 25.000 Fortinet-apparaten met FortiCloud SSO, waarvan bijna vierhonderd in Nederland, zijn toegankelijk vanaf het internet en lopen daarmee risico om te worden aangevallen, aldus The Shadowserve ... Read more
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The Hacker News
WatchGuard Warns of Active Exploitation of Critical Fireware OS VPN Vulnerability
Dec 19, 2025Ravie LakshmananVulnerability / Network Security WatchGuard has released fixes to address a critical security flaw in Fireware OS that it said has been exploited in real-world attacks. T ... Read more
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Help Net Security
Attackers are exploiting auth bypass vulnerability on FortiGate firewalls (CVE-2025-59718)
Attackers are exploiting a recently revealed vulnerability (CVE-2025-59718) to bypass authentication on Fortinet’s FortiGate firewalls, and are leveraging the achieved access to export their system co ... Read more
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CybersecurityNews
CISA Adds Fortinet Vulnerability to KEV Catalog After Active Exploitation
CISA has officially added CVE-2025-59718 to its Known Exploited Vulnerabilities (KEV) catalog on December 16, 2025. Designating a critical deadline of December 23, 2025, for organizations to apply nec ... Read more
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BleepingComputer
Hackers exploit newly patched Fortinet auth bypass flaws
Hackers are exploiting critical-severity vulnerabilities affecting multiple Fortinet products to get unauthorized access to admin accounts and steal system configuration files. The two vulnerabilities ... Read more
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The Hacker News
Fortinet FortiGate Under Active Attack Through SAML SSO Authentication Bypass
Dec 16, 2025Ravie LakshmananNetwork Security / Vulnerability Threat actors have begun to exploit two newly disclosed security flaws in Fortinet FortiGate devices, less than a week after public discl ... Read more
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security.nl
'Kritieke Fortinet-lekken 3 dagen na bekendmaking misbruikt bij aanvallen'
Twee kritieke kwetsbaarheden in verschillende Fortinet-producten zijn vorige week misbruikt bij aanvallen, drie dagen nadat ze bekend waren gemaakt. Dat meldt securitybedrijf Arctic Wolf. De twee beve ... Read more
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CybersecurityNews
Critical FortiGate Devices SSO Vulnerabilities Actively Exploited in the Wild
An active intrusion is targeting critical authentication bypass vulnerabilities in Fortinet’s FortiGate appliances and related products. Threat actors are exploiting CVE-2025-59718 and CVE-2025-59719 ... Read more
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Daily CyberSecurity
Critical FortiGate SSO Flaw Under Active Exploitation: Attackers Bypass Auth and Exfiltrate Configs
A critical security crisis is unfolding for Fortinet administrators this week. Just days after the vendor disclosed two high-severity vulnerabilities, threat actors have begun actively exploiting them ... Read more
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TheCyberThrone
CISA adds Chrome ans Sierra Bugs to KEV Catalog
CISA has added two high‑impact vulnerabilities—CVE‑2025‑14174 in Google Chromium and CVE‑2018‑4063 in Sierra Wireless AirLink ALEOS—to the Known Exploited Vulnerabilities (KEV) catalog after confirmin ... Read more
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TheCyberThrone
GeoServer CVE-2025-58360 added to CISA KEV
Why this vulnerability mattersCVE-2025-58360 is a recently disclosed XML External Entity (XXE) vulnerability in OSGeo GeoServer that has now been added to the CISA Known Exploited Vulnerabilities (KEV ... Read more
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TheCyberThrone
Fortinet Critical Bugs CVE-2025-59718 and CVE-2025-59719
December 11, 2025Fortinet recently disclosed two critical authentication bypass vulnerabilities in its FortiCloud SSO login feature, tracked as CVE-2025-59718 and CVE-2025-59719. These flaws allow una ... Read more
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The Cyber Express
Microsoft Patch Tuesday December 2025: One Zero-Day, Six High-Risk Flaws Fixed
Microsoft patched 57 vulnerabilities in its Patch Tuesday December 2025 update, including one exploited zero-day and six high-risk vulnerabilities. The exploited zero-day is CVE-2025-62221, a 7.8-rate ... Read more
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security.nl
Fortinet waarschuwt voor kritieke authenticatie bypass in meerdere producten
Fortinet waarschuwt voor twee kritieke kwetsbaarheden in verschillende producten waardoor aanvallers de authenticatie van systemen kunnen omzeilen om hier zo toegang toe te krijgen. De beveiligingslek ... Read more
-
The Hacker News
Fortinet, Ivanti, and SAP Issue Urgent Patches for Authentication and Code Execution Flaws
Fortinet, Ivanti, and SAP have moved to address critical security flaws in their products that, if successfully exploited, could result in an authentication bypass and code execution. The Fortinet vul ... Read more
-
Daily CyberSecurity
Critical Fortinet Flaw Risks Unauthenticated Admin Bypass via FortiCloud SSO SAML Forgery
Fortinet has issued an urgent security advisory following the discovery of a critical vulnerability affecting its flagship network security products. The flaw, which carries a critical CVSS score of 9 ... Read more
-
BleepingComputer
Fortinet warns of critical FortiCloud SSO login auth bypass flaws
Fortinet has released security updates to address two critical vulnerabilities in FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager that could allow attackers to bypass FortiCloud SSO authenticati ... Read more
The following table lists the changes that have been made to the
CVE-2025-59719 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 09, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* versions from (including) 7.4.0 up to (including) 7.4.9 *cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* versions from (including) 7.6.0 up to (including) 7.6.4 *cpe:2.3:a:fortinet:fortiweb:8.0.0:*:*:*:*:*:*:* Added Reference Type Fortinet, Inc.: https://fortiguard.fortinet.com/psirt/FG-IR-25-647 Types: Vendor Advisory -
New CVE Received by [email protected]
Dec. 09, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-347 Added Reference https://fortiguard.fortinet.com/psirt/FG-IR-25-647