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Multiple vulnerabilities in Fortinet products

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

FortiOS versions 7.6.0 through 7.6.4

FortiSandbox versions 5.0.0 through 5.0.1

FortiSandbox versions 4.4.0 through 4.4.7

FortiSandbox versions 4.2 (all versions)

FortiSandbox versions 4.0 (all versions)

Overview

Multiple vulnerabilities have been identified in Fortinet products that could allow an unauthenticated remote attacker to bypass LDAP authentication mechanisms or execute malicious scripts on the targeted system.

Target Audience:

All organizations and individuals using the affected Fortinet products.

Risk Assessment:

Potential for unauthorized access and execution of malicious scripts due to authentication bypass and improper input handling.

Impact Assessment:

High risk of unauthorized network access, user impersonation, session compromise, and potential exposure of sensitive information.

Description

Fortinet develops enterprise security solutions that provide VPN authentication, policy enforcement, and advanced threat detection capabilities.

These issues stem from improper handling of LDAP authentication requests within the operating system component and insufficient neutralization of user-supplied input in the web-based analysis interface. An attacker may exploit these weaknesses to bypass LDAP authentication controls in Agentless VPN or FSSO configurations and execute malicious scripts through crafted web requests.

Successful exploitation could allow an unauthenticated attacker to gain unauthorized access to protected network resources and perform actions within a victims browser session.

Solution

Apply appropriate updates as mentioned as mentioned by the Vendor:

https://fortiguard.fortinet.com/psirt/FG-IR-25-093

https://fortiguard.fortinet.com/psirt/FG-IR-25-1052

Vendor Information

Fortinet

https://fortiguard.fortinet.com/psirt/FG-IR-25-093

https://fortiguard.fortinet.com/psirt/FG-IR-25-1052

References

 

https://fortiguard.fortinet.com/psirt/FG-IR-25-093

https://fortiguard.fortinet.com/psirt/FG-IR-25-1052

CVE Name

CVE-2025-52436

CVE-2026-22153

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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