ManageEngine Log360 Authentication Bypass Vulnerability (CVE-2026-3324)

CVE-2026-3324 describes an authentication bypass vulnerability affecting Zohocorp ManageEngine Log360. Specifically, versions 13000 through 13013 are susceptible due to an improper filter configuration. This flaw could allow an attacker to bypass authentication mechanisms for certain actions within the application. While the full scope of affected actions isn't specified in the provided source, the potential for unauthorized access to sensitive log data and system configuration makes this a critical vulnerability for organizations using the affected Log360 versions. Successful exploitation would likely grant an attacker elevated privileges, potentially leading to data breaches, system compromise, or denial of service. Defenders should prioritize patching or mitigating this vulnerability.

Attack Chain

1. Attacker identifies a vulnerable ManageEngine Log360 instance running a version between 13000 and 13013.
2. Attacker crafts a malicious request targeting a specific action susceptible to the authentication bypass. This might involve manipulating request parameters or headers.
3. The malicious request bypasses the intended authentication filters due to the improper configuration, granting unauthorized access.
4. Attacker gains access to sensitive functionality, such as viewing, modifying, or deleting log data.
5. Attacker escalates privileges within the application, potentially gaining administrative control.
6. Attacker uses elevated privileges to compromise the underlying system, potentially installing malware or creating unauthorized accounts.
7. Attacker pivots to other systems within the network, leveraging the compromised Log360 instance as a foothold.

Impact

Successful exploitation of CVE-2026-3324 allows attackers to bypass authentication in ManageEngine Log360, potentially leading to full system compromise. Given that Log360 is often used in security operations centers, this could allow attackers to cover their tracks, disable security controls, or gain access to highly sensitive log data. The impact ranges from data breaches and system outages to the deployment of ransomware.

Recommendation

• Upgrade ManageEngine Log360 to a version beyond 13013 to patch CVE-2026-3324.
• Deploy the Sigma rule provided in this brief to your SIEM to detect potential exploitation attempts targeting CVE-2026-3324, focusing on suspicious web requests (logsource: webserver).
• Review access controls and network segmentation to limit the impact of potential breaches originating from the Log360 server.