CVE-2026-14308: ManageEngine Privilege Escalation Flaw

CVE-2026-14308 Overview

CVE-2026-14308 affects Zohocorp ManageEngine Malware Protection Plus versions prior to 1.0.64.12. The vulnerability stems from insufficient driver signature validation in the MEARWService component. An attacker with high privileges and physical access to the host can load a driver that bypasses signature checks, disrupting the availability of protected system components. The weakness is categorized under CWE-20: Improper Input Validation. Zoho has published a knowledge base article describing the issue and the fixed build.

Critical Impact
Insufficient driver signature validation in MEARWService allows a locally authenticated, high-privileged attacker with physical access to compromise system availability on affected ManageEngine Malware Protection Plus installations.

Affected Products

Zohocorp ManageEngine Malware Protection Plus versions before 1.0.64.12
The MEARWService component responsible for driver loading
Endpoint Detection and Response (EDR) module shipped with Malware Protection Plus

Discovery Timeline

2026-10-13 - CVE-2026-14308 published to the National Vulnerability Database
2026-10-15 - Last updated in NVD database

Technical Details for CVE-2026-14308

Vulnerability Analysis

The flaw resides in MEARWService, a service component of ManageEngine Malware Protection Plus. The service loads kernel-mode drivers without performing sufficient signature verification. An attacker who can execute code with high privileges on the host and has physical access can substitute or supply a driver that would otherwise be rejected by a complete signature check. Because the attack impacts a kernel-level service bundled with security tooling, exploitation changes the security scope of the system and can halt the protection functions that depend on the driver.

Root Cause

The root cause is improper input validation [CWE-20] applied to driver images loaded by MEARWService. Signature verification logic does not fully enforce the authenticity and integrity of the driver before it is accepted by the service. Weak validation of trusted inputs at a privileged boundary allows a tampered or unauthorized driver to be processed as legitimate.

Attack Vector

Exploitation requires physical access to the target host and existing high-privilege credentials on the system. User interaction is not required. The attack path is local: an operator at the console places a crafted driver where MEARWService consumes it, and the service accepts the driver despite failed or incomplete signature checks. The outcome is a loss of availability for components that depend on the service and the driver it loads. See the ManageEngine KB: Insufficient Driver Signature advisory for vendor-provided technical context.

// No verified proof-of-concept code is available for CVE-2026-14308.
// Refer to the ManageEngine knowledge base article for vendor technical details.

Detection Methods for CVE-2026-14308

Indicators of Compromise

Unexpected driver files appearing in directories read by MEARWService on hosts running ManageEngine Malware Protection Plus.
MEARWService crashes, restarts, or availability loss of the EDR module without a corresponding administrative action.
Windows service control manager events indicating driver load failures or unsigned driver load attempts tied to the Malware Protection Plus install path.

Detection Strategies

Inventory installed versions of ManageEngine Malware Protection Plus and flag any build older than 1.0.64.12.
Monitor kernel driver load events (Windows Event ID 7045 and Code Integrity events in the Microsoft-Windows-CodeIntegrity/Operational log) for drivers associated with MEARWService.
Correlate physical console logons from privileged accounts with subsequent changes to the Malware Protection Plus installation directory.

Monitoring Recommendations

Alert on modifications to binaries and drivers within the ManageEngine Malware Protection Plus installation path.
Track service health metrics for MEARWService and raise an incident on unexpected termination or restart loops.
Review audit logs for privileged local logons on servers hosting the Malware Protection Plus agent.

How to Mitigate CVE-2026-14308

Immediate Actions Required

Upgrade Zohocorp ManageEngine Malware Protection Plus to version 1.0.64.12 or later on every affected host.
Restrict physical access to systems running the Malware Protection Plus service, including console and removable media controls.
Audit local administrator and equivalent high-privilege accounts and remove any that are not required for operations.

Patch Information

Zoho has released version 1.0.64.12 of ManageEngine Malware Protection Plus, which corrects the signature validation logic in MEARWService. Administrators should apply the update using the vendor's standard upgrade procedure. Full remediation details are available in the ManageEngine KB: Insufficient Driver Signature advisory.

Workarounds

Enforce strict physical security controls, including locked server rooms and disabled external ports, on hosts that cannot be patched immediately.
Limit high-privilege local accounts and require multi-person approval for console sessions on affected servers.
Apply operating system driver block policies, such as Microsoft's vulnerable driver blocklist, to reduce the surface for unsigned or revoked drivers.

bash

# Verify installed ManageEngine Malware Protection Plus version on Windows
reg query "HKLM\SOFTWARE\Wow6432Node\ZOHO Corp\ManageEngine Malware Protection Plus" /v Version

# Confirm MEARWService state and binary path
sc qc MEARWService