CVE-2026-22886: OpenMQ Auth Bypass Vulnerability

CVE-2026-22886 Overview

OpenMQ exposes a TCP-based management service (imqbrokerd) that by default requires authentication. However, the product ships with a default administrative account (admin/admin) and does not enforce a mandatory password change on first use. After the first successful login, the server continues to accept the default password indefinitely without warning or enforcement.

In real-world deployments, this service is often left enabled without changing the default credentials. As a result, a remote attacker with access to the service port could authenticate as an administrator and gain full control of the protocol's administrative features.

Critical Impact

Remote attackers can authenticate with default credentials and gain full administrative control over OpenMQ message broker instances, potentially compromising the entire messaging infrastructure.

Affected Products

• OpenMQ Message Broker (imqbrokerd service)

Discovery Timeline

• 2026-03-03 - CVE CVE-2026-22886 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2026-22886

Vulnerability Analysis

This vulnerability falls under CWE-1391 (Use of Weak Credentials), representing a fundamental insecure default configuration flaw. The OpenMQ message broker ships with a pre-configured administrative account using easily guessable default credentials (admin/admin). The critical security failure is twofold: not only does the system ship with these predictable credentials, but it also fails to enforce a mandatory password change upon first use or subsequent logins.

The vulnerability enables complete administrative takeover of the OpenMQ broker service. An attacker who successfully authenticates gains the ability to manage queues, topics, message delivery, and broker configuration—potentially intercepting, modifying, or disrupting message flow across the entire messaging infrastructure.

Root Cause

The root cause stems from an insecure default configuration where OpenMQ ships with hardcoded default credentials and lacks enforcement mechanisms for credential rotation. The system does not implement first-use password change requirements, credential expiration policies, or warnings to administrators about the security risks of default credentials. This design choice prioritizes ease of initial setup over security posture.

Attack Vector

The attack leverages network access to the OpenMQ management service port. An attacker performs reconnaissance to identify systems running the imqbrokerd service, then attempts authentication using the well-known default credentials admin/admin. Upon successful authentication, the attacker gains full administrative privileges, enabling them to:

• Access and manipulate message queues and topics
• Modify broker configuration settings
• Create, delete, or alter user accounts
• Intercept or inject messages into the messaging system
• Potentially pivot to connected systems through the messaging infrastructure

The attack requires no special tools beyond a TCP client capable of interacting with the OpenMQ management protocol, and the default credentials are publicly documented in vendor materials.

Detection Methods for CVE-2026-22886

Indicators of Compromise

• Multiple authentication attempts to the OpenMQ management service from external or unexpected IP addresses
• Successful administrative logins using the default admin account, especially from unfamiliar network segments
• Unexpected configuration changes to the OpenMQ broker, including new user accounts or modified queue/topic settings
• Anomalous administrative API calls or management operations during non-business hours

Detection Strategies

• Implement network monitoring on the OpenMQ management service port to detect connection attempts from unauthorized sources
• Enable comprehensive authentication logging and alert on successful logins using the default admin account
• Deploy intrusion detection rules to identify default credential usage patterns in authentication traffic
• Conduct regular credential audits to identify systems still using default or weak administrative passwords

Monitoring Recommendations

• Configure SIEM rules to correlate authentication events with known default credential patterns
• Establish baseline administrative activity and alert on deviations indicating potential unauthorized access
• Monitor for privilege escalation activities and unauthorized configuration modifications
• Implement network segmentation monitoring to detect lateral movement from compromised broker systems

How to Mitigate CVE-2026-22886

Immediate Actions Required

• Change the default administrative password immediately on all OpenMQ instances to a strong, unique credential
• Restrict network access to the imqbrokerd management service using firewall rules, limiting connectivity to authorized management hosts only
• Audit all existing OpenMQ deployments to identify instances that may be using default credentials
• Review administrative user accounts and remove or disable any unnecessary privileged accounts

Patch Information

Organizations should consult the GitLab CVE Assignment Issue for vendor guidance and potential patches. Until a formal patch is available that enforces credential changes, organizations must implement manual credential rotation and access controls as compensating measures.

Workarounds

• Implement network segmentation to isolate OpenMQ management interfaces from untrusted networks
• Deploy strong, complex passwords for all administrative accounts following organizational password policies
• Enable multi-factor authentication for administrative access if supported by the deployment environment
• Consider placing the management service behind a VPN or jump host to restrict direct network exposure
• Implement IP allowlisting at the network or application level to restrict management access to authorized systems only

# Configuration example
# Restrict access to OpenMQ management port via firewall
# Example using iptables to limit access to management hosts only
iptables -A INPUT -p tcp --dport 7676 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 7676 -j DROP

# Verify no default credentials are in use by checking user configuration
# Review imqusermgr output for default accounts
imqusermgr list -u admin