CVE-2026-3324: ManageEngine Log360 Auth Bypass Flaw

CVE-2026-3324 Overview

CVE-2026-3324 is an authentication bypass vulnerability affecting Zohocorp ManageEngine Log360 versions 13000 through 13013. The vulnerability arises from improper filter configuration, allowing attackers to bypass authentication mechanisms on certain actions within the application. This flaw enables unauthorized access to protected functionality without valid credentials.

Critical Impact

Unauthenticated attackers can bypass authentication controls on certain actions in ManageEngine Log360, potentially gaining unauthorized access to sensitive log management data and security information.

Affected Products

• Zohocorp ManageEngine Log360 version 13000
• Zohocorp ManageEngine Log360 versions 13001 through 13012
• Zohocorp ManageEngine Log360 version 13013

Discovery Timeline

• April 16, 2026 - CVE CVE-2026-3324 published to NVD
• April 16, 2026 - Last updated in NVD database

Technical Details for CVE-2026-3324

Vulnerability Analysis

This vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path or Channel). The flaw exists in ManageEngine Log360's filter configuration, which fails to properly enforce authentication requirements for certain application actions. When specific endpoints or actions are accessed, the application's security filters do not adequately validate whether the requesting user has been authenticated, creating an alternate path that bypasses normal authentication controls.

ManageEngine Log360 is a comprehensive security information and event management (SIEM) solution used by organizations to collect, monitor, and analyze log data from various sources. The authentication bypass vulnerability in this product is particularly concerning given the sensitive nature of the security and log data it handles.

Root Cause

The root cause of CVE-2026-3324 is improper filter configuration within the ManageEngine Log360 application. The security filters responsible for enforcing authentication on protected actions are not correctly applied to all endpoints, leaving certain actions accessible without proper credential validation. This misconfiguration allows requests to reach protected functionality through paths that should require authentication but do not enforce it.

Attack Vector

The vulnerability is exploitable over the network without requiring any authentication or user interaction. An attacker can craft specific HTTP requests targeting the misconfigured endpoints to access protected actions without valid credentials. The attack vector involves:

1. Identifying endpoints in ManageEngine Log360 that have improper filter configurations
2. Sending crafted requests directly to these vulnerable endpoints
3. Bypassing authentication controls to access protected functionality
4. Potentially accessing sensitive log data, configuration settings, or performing unauthorized actions

Since no authentication is required, this vulnerability can be exploited remotely by any attacker with network access to the ManageEngine Log360 instance.

Detection Methods for CVE-2026-3324

Indicators of Compromise

• Unexpected access to Log360 administrative functions from unauthenticated sessions
• Unusual HTTP requests to Log360 endpoints without corresponding authentication events
• Access logs showing requests to sensitive endpoints without prior login activity
• Anomalous data retrieval patterns from the Log360 application

Detection Strategies

• Monitor web server access logs for requests to protected ManageEngine Log360 endpoints that lack session authentication tokens
• Implement network-level monitoring to detect unusual traffic patterns to Log360 instances
• Deploy web application firewall (WAF) rules to detect and block requests attempting to access protected endpoints without authentication
• Review application audit logs for unauthorized access attempts or suspicious activity patterns

Monitoring Recommendations

• Enable comprehensive logging for all ManageEngine Log360 access attempts and authentication events
• Configure alerts for access to administrative or sensitive endpoints without valid session data
• Implement network segmentation to limit exposure of Log360 instances to untrusted networks
• Establish baseline traffic patterns and alert on deviations indicating potential exploitation

How to Mitigate CVE-2026-3324

Immediate Actions Required

• Upgrade ManageEngine Log360 to a patched version beyond 13013 as soon as vendor patches are available
• Restrict network access to ManageEngine Log360 instances to trusted IP addresses and networks only
• Review and audit all access logs for signs of unauthorized access or exploitation attempts
• Implement additional network-level authentication controls such as VPN or firewall rules

Patch Information

Zohocorp has published a security advisory addressing this vulnerability. Organizations using affected versions of ManageEngine Log360 (13000 through 13013) should consult the ManageEngine Security Advisory for detailed patch information and upgrade instructions. Apply the vendor-provided security update immediately to remediate this vulnerability.

Workarounds

• Implement network-level access controls to restrict Log360 access to trusted internal networks only
• Deploy a reverse proxy with additional authentication requirements in front of the Log360 application
• Enable IP-based access restrictions within ManageEngine Log360 configuration
• Monitor access logs closely for any unauthorized access until patching is complete

# Example: Restrict network access to ManageEngine Log360 using iptables
# Allow access only from trusted internal subnet
iptables -A INPUT -p tcp --dport 8443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8443 -j DROP