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 1 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).
parse SAML responses from a pcap
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
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
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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
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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
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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