Authentication Bypass Vulnerability in Fortinet FortiOS

CVE-2026-22153

What is CVE-2026-22153?

CVE-2026-22153 is an authentication bypass vulnerability identified in Fortinet's FortiOS, specifically affecting versions 7.6.0 through 7.6.4. FortiOS is a critical operating system that underpins Fortinet's security products, providing essential functions such as VPN services and firewall policies. The vulnerability stems from a flaw related to LDAP authentication, whereby an unauthenticated attacker can bypass the authentication mechanisms of Agentless VPN or FSSO policies, contingent on specific configurations of the remote LDAP server. This type of authentication bypass could allow malicious actors to gain unauthorized access to sensitive resources and systems, significantly heightening the risk of data breaches and compromising the integrity of network security.

Potential impact of CVE-2026-22153

1. Unauthorized Access: The primary impact of the vulnerability is the potential for unauthorized entities to gain access to sensitive systems and information, undermining the integrity of the network security architecture.

2. Data Breaches: By exploiting this vulnerability, attackers could potentially exfiltrate confidential data, leading to serious data breaches that could have significant financial and reputational consequences for organizations.

3. Increased Risk of Malware Deployment: The ability to bypass authentication measures may facilitate further malicious activities, such as deploying ransomware or other forms of malware, thereby broadening the attack surface for organizations using FortiOS.

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