CVE-2026-75825: ManageEngine OpManager Auth Bypass Flaw

CVE-2026-75825 Overview

CVE-2026-75825 is an authentication bypass vulnerability in ZohoCorp ManageEngine OpManager. The flaw affects OpManager versions 12.8.710 and below when the Application Manager Plugin is enabled. The vulnerability is classified under [CWE-306] Missing Authentication for Critical Function. An attacker with low-level network access can bypass authentication controls to compromise confidentiality, integrity, and availability of the affected system.

Critical Impact
Authenticated attackers with minimal privileges can bypass authentication checks in the Application Manager Plugin, gaining access to protected functions across network monitoring infrastructure.

Affected Products

ZohoCorp ManageEngine OpManager versions 12.8.710 and below
OpManager deployments with the Application Manager Plugin enabled
Related ManageEngine ITOM products bundling the affected OpManager build

Discovery Timeline

2026-09-23 - CVE-2026-75825 published to the National Vulnerability Database
2026-09-24 - Last updated in NVD database

Technical Details for CVE-2026-75825

Vulnerability Analysis

CVE-2026-75825 stems from missing authentication enforcement in the Application Manager Plugin component of ManageEngine OpManager. The plugin exposes functionality that should require authenticated, privileged access but fails to validate the caller's session or role. An attacker who reaches the OpManager web interface over the network can invoke protected operations without completing proper authentication.

The vulnerability requires only low-level privileges to exploit. Successful exploitation grants access to monitoring data, device credentials, and management functions typically restricted to administrators. Because OpManager centrally monitors network infrastructure, compromise of this system can serve as a pivot point into managed devices, routers, switches, and servers across the enterprise.

Root Cause

The root cause is [CWE-306] Missing Authentication for a Critical Function within the Application Manager Plugin code path. The plugin's request handlers do not verify authentication tokens or session state before executing sensitive actions. This design flaw allows bypass of the standard OpManager authentication layer when the plugin is active.

Attack Vector

Exploitation occurs over the network against the OpManager management interface. The attacker requires network reachability to the OpManager server and low-level authenticated access. No user interaction is required. Once the authentication bypass is triggered, the attacker inherits elevated access to plugin-exposed operations. Refer to the ManageEngine Security Advisory CVE-2026-75825 for vendor-published technical details.

Detection Methods for CVE-2026-75825

Indicators of Compromise

Unexpected requests to Application Manager Plugin endpoints from low-privilege or unauthenticated sessions
Access to sensitive OpManager URLs without preceding authentication events in access logs
New administrative actions, credential retrievals, or device configuration changes originating from anomalous source IP addresses
Outbound connections from the OpManager server to unknown external hosts following plugin activity

Detection Strategies

Correlate OpManager web server access logs with authentication logs to identify plugin requests that lack matching login events
Review Application Manager Plugin audit records for privileged actions performed by accounts without the corresponding role
Baseline normal plugin usage patterns and alert on volume or timing anomalies in plugin API calls

Monitoring Recommendations

Enable verbose logging on the OpManager application server and forward logs to a centralized SIEM for correlation
Monitor for lateral movement from the OpManager host into monitored network devices using stored SNMP or SSH credentials
Track configuration changes to OpManager user roles, API tokens, and integration settings

How to Mitigate CVE-2026-75825

Immediate Actions Required

Upgrade ManageEngine OpManager to a version above 12.8.710 as directed in the vendor advisory
Restrict network access to the OpManager management interface using firewall rules or VPN-only access
Rotate credentials stored within OpManager, including SNMP community strings, device passwords, and API tokens
Review recent Application Manager Plugin activity for signs of prior exploitation

Patch Information

ZohoCorp has published remediation guidance in the ManageEngine Security Advisory CVE-2026-75825. Administrators should apply the fixed OpManager build referenced in the advisory. Verify the installed version after upgrade to confirm the patch is active.

Workarounds

Disable the Application Manager Plugin on OpManager instances where the plugin is not required for operations
Place the OpManager server behind a reverse proxy that enforces additional authentication controls
Segment the OpManager server into a restricted management VLAN accessible only from administrative workstations

bash

# Configuration example: restrict OpManager access at the network layer
iptables -A INPUT -p tcp --dport 8060 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8060 -j DROP