CVE-2026-3182: ManageEngine Endpoint Central Cleartext Vuln

CVE-2026-3182 Overview

CVE-2026-3182 affects Zohocorp ManageEngine Endpoint Central versions before 11.4.2528.34. The product transmits sensitive information in cleartext, exposing data to network-based interception [CWE-319]. The flaw requires network access and low-privilege authentication to exploit, and it impacts confidentiality without affecting integrity or availability.

An attacker positioned on the network path can capture credentials, tokens, or configuration data as they traverse the wire. The issue is documented in the ManageEngine mail configuration guidance and remediated in the fixed release.

Critical Impact
Authenticated attackers with network access can intercept sensitive configuration data, including mail server credentials, transmitted by ManageEngine Endpoint Central over unencrypted channels.

Affected Products

Zohocorp ManageEngine Endpoint Central versions prior to 11.4.2528.34
Deployments using unencrypted mail server configuration
Endpoint Central components handling sensitive credential transmission

Discovery Timeline

2026-07-21 - CVE-2026-3182 published to the National Vulnerability Database
2026-07-21 - Last updated in the NVD database

Technical Details for CVE-2026-3182

Vulnerability Analysis

CVE-2026-3182 is a cleartext transmission of sensitive information vulnerability classified under [CWE-319]. Zohocorp ManageEngine Endpoint Central sends sensitive data across the network without applying transport-layer encryption. Attackers with the ability to observe network traffic between the Endpoint Central server and connected services can read this data in plaintext.

The vulnerability requires low-privilege authentication and network access. It affects confidentiality only, meaning attackers cannot modify data or disrupt service through this flaw alone. However, harvested credentials can enable follow-on attacks against mail servers, directory services, or other integrated infrastructure.

Endpoint Central is a unified endpoint management platform used to manage servers, workstations, and mobile devices. Compromise of credentials transmitted by the management server creates a pivot point into managed infrastructure.

Root Cause

The root cause is the absence of enforced encryption on sensitive network communications. Configuration flows involving credentials or tokens transit the network without TLS protection or with optional encryption disabled by default. Any party with access to intermediate network segments can passively collect this data.

Attack Vector

The attack vector is network-based. An attacker must obtain a low-privileged account and gain a position on the network path, such as a compromised host, an ARP-spoofing foothold on the same VLAN, or access to a span port. The attacker then captures traffic and extracts the sensitive information transmitted in cleartext. No user interaction is required. See the ManageEngine Mail Configuration Guide for details on configuration flows involved.

Detection Methods for CVE-2026-3182

Indicators of Compromise

Unencrypted SMTP, LDAP, or HTTP traffic originating from the Endpoint Central server on ports commonly associated with cleartext protocols such as 25, 389, or 80
Repeated authentication attempts against mail or directory services from hosts other than the Endpoint Central server, suggesting credential replay
Unexpected packet capture tooling or promiscuous-mode interfaces on hosts in the same broadcast domain as the Endpoint Central server

Detection Strategies

Inspect network flows between the Endpoint Central server and integrated services for use of unencrypted protocols
Monitor Endpoint Central application logs for configuration changes to mail or authentication settings performed by low-privileged accounts
Correlate captured cleartext credential exposure with subsequent authentication events from unexpected source addresses

Monitoring Recommendations

Enable full packet capture or NetFlow monitoring on segments carrying Endpoint Central management traffic
Alert on any use of plaintext SMTP (AUTH LOGIN without STARTTLS) or LDAP simple bind from the Endpoint Central host
Track version and patch state of ManageEngine Endpoint Central instances through asset inventory and vulnerability management tooling

How to Mitigate CVE-2026-3182

Immediate Actions Required

Upgrade Zohocorp ManageEngine Endpoint Central to version 11.4.2528.34 or later
Rotate any credentials previously configured in Endpoint Central, including mail server, directory service, and integration account passwords
Restrict network access to the Endpoint Central server to trusted management segments only

Patch Information

Zohocorp resolves CVE-2026-3182 in ManageEngine Endpoint Central version 11.4.2528.34. Administrators should download the fixed build from the vendor and apply it to all Endpoint Central instances. Refer to the ManageEngine Mail Configuration Guide for post-upgrade configuration guidance that enforces encrypted transport.

Workarounds

Reconfigure integrated services to require TLS, such as enabling STARTTLS or SMTPS on the mail server and LDAPS on directory services
Segment the Endpoint Central server onto an isolated management VLAN to reduce the number of hosts capable of observing traffic
Enforce IPsec or a management VPN between the Endpoint Central server and integrated infrastructure to encrypt otherwise cleartext protocols

bash

# Configuration example: verify Endpoint Central version and restrict management access
# Check installed version
grep -i "build" /opt/ManageEngine/DesktopCentral_Server/bin/setup.conf

# Restrict inbound access to management subnet only (Linux example)
iptables -A INPUT -p tcp --dport 8020 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8020 -j DROP