CVE-2026-30831: Rocket.Chat Auth Bypass Vulnerability

CVE-2026-30831 Overview

CVE-2026-30831 is an authentication bypass vulnerability affecting Rocket.Chat, an open-source, secure, and fully customizable communications platform. The vulnerability exists in Rocket.Chat's enterprise DDP Streamer service, where the Account.login method fails to enforce Two-Factor Authentication (2FA) and does not validate user account status. This allows deactivated users to successfully authenticate, bypassing security controls that are otherwise mandatory in the standard Meteor login flow.

Critical Impact

Attackers can bypass 2FA requirements and authenticate as deactivated users, potentially gaining unauthorized access to enterprise communication systems and sensitive organizational data.

Affected Products

• Rocket.Chat versions prior to 7.10.8
• Rocket.Chat versions prior to 7.11.5, 7.12.5, 7.13.4
• Rocket.Chat versions prior to 8.0.2, 8.1.1, and 8.2.0

Discovery Timeline

• 2026-03-06 - CVE CVE-2026-30831 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-30831

Vulnerability Analysis

This authentication bypass vulnerability (CWE-287) stems from inconsistent security enforcement within Rocket.Chat's authentication mechanisms. The enterprise DDP (Distributed Data Protocol) Streamer service exposes an Account.login method that operates outside the standard Meteor login flow. While the standard authentication pathway properly enforces 2FA verification and validates account status, the DDP Streamer endpoint lacks these critical security checks.

The vulnerability presents a significant risk to enterprise deployments as it undermines fundamental access control mechanisms. Organizations relying on 2FA for enhanced security or using account deactivation as part of their offboarding procedures may be unknowingly exposed to unauthorized access.

Root Cause

The root cause of this vulnerability is the failure to implement consistent security controls across all authentication endpoints. The Account.login method exposed through the DDP Streamer service was not properly integrated with the existing authentication framework that enforces 2FA and account status validation. This represents a broken access control condition where an alternative authentication path bypasses security measures that are enforced elsewhere in the application.

Attack Vector

The vulnerability is exploitable over the network without requiring any user interaction or special privileges. An attacker with knowledge of the DDP Streamer endpoint can directly invoke the Account.login method to authenticate. The attack scenario involves:

1. An attacker identifies a Rocket.Chat instance with the enterprise DDP Streamer service enabled
2. The attacker sends authentication requests directly to the DDP Streamer endpoint
3. If the target account has 2FA enabled, the attacker bypasses this requirement entirely
4. If the target account has been deactivated, the authentication still succeeds

This allows unauthorized access to accounts that should otherwise be protected by multi-factor authentication or that have been explicitly disabled by administrators.

Detection Methods for CVE-2026-30831

Indicators of Compromise

• Successful authentication events for user accounts that have been deactivated in the system
• Login activity from accounts configured with 2FA that show no corresponding 2FA verification logs
• Authentication requests originating from the DDP Streamer service without associated standard login flow events
• Unusual login patterns or access from unexpected locations for accounts that should require 2FA

Detection Strategies

• Monitor authentication logs for logins via the DDP Streamer endpoint and compare against standard login flow events
• Implement alerting for any successful authentication by accounts marked as deactivated in the user database
• Cross-reference 2FA-enabled account logins with 2FA verification logs to identify bypassed authentications
• Deploy network monitoring to track direct DDP protocol connections to identify potential exploitation attempts

Monitoring Recommendations

• Enable detailed audit logging for all authentication events across both standard and DDP Streamer endpoints
• Configure SIEM rules to alert on authentication anomalies, particularly deactivated user logins
• Regularly review access logs for accounts that have 2FA enabled to ensure verification events are present
• Monitor for reconnaissance activity targeting DDP endpoints

How to Mitigate CVE-2026-30831

Immediate Actions Required

• Upgrade Rocket.Chat to patched versions: 7.10.8, 7.11.5, 7.12.5, 7.13.4, 8.0.2, 8.1.1, or 8.2.0
• Review authentication logs for any signs of exploitation prior to patching
• Verify that all deactivated user accounts have not had any recent login activity
• Force password resets for any accounts that may have been compromised

Patch Information

Rocket.Chat has addressed this vulnerability in multiple version branches. Organizations should upgrade to the following patched versions based on their current deployment:

For detailed information about the security fix, refer to the GitHub Security Advisory.

Workarounds

• Restrict network access to the DDP Streamer service using firewall rules until patching can be completed
• Implement additional network-level authentication controls for enterprise communication endpoints
• Consider temporarily disabling the enterprise DDP Streamer service if it is not critical to operations
• Monitor deactivated accounts closely and consider removing them entirely from the system until patched

# Example: Restrict DDP Streamer access via firewall (iptables)
# Allow only trusted internal networks to access DDP port
iptables -A INPUT -p tcp --dport 3000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP