CVE-2025-59718
Fortinet FortiOS and FortiProxy Cryptographic Signature Bypass Vulnerability
Description
A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows 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, 8:05 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-59718
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
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 FortiOS to a fixed version.
- Update FortiProxy to a fixed version.
- Update FortiSwitchManager to a fixed version.
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-2025-59718.
| 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-2025-59718 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-2025-59718
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-59718 vulnerability anywhere in the article.
-
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-2025-59718 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:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (including) 7.0.17 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (including) 7.2.11 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.4.0 up to (including) 7.4.8 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 7.6.0 up to (including) 7.6.3 *cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (including) 7.0.21 *cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (including) 7.2.14 *cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* versions from (including) 7.4.0 up to (including) 7.4.10 *cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* versions from (including) 7.6.0 up to (including) 7.6.3 *cpe:2.3:a:fortinet:fortiswitchmanager:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (including) 7.0.5 *cpe:2.3:a:fortinet:fortiswitchmanager:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (including) 7.2.6 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 A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows 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