CVE-2026-3183 Overview
CVE-2026-3183 is a Multi-Factor Authentication (MFA) bypass vulnerability affecting Zohocorp ManageEngine ADSelfService Plus versions before build 6524. The flaw is classified under [CWE-290] (Authentication Bypass by Spoofing) and allows an authenticated attacker with low privileges to circumvent the secondary authentication factor over the network. ADSelfService Plus is a self-service password management and single sign-on solution for Active Directory, making authentication bypass issues particularly impactful for identity infrastructure.
Critical Impact
An attacker with low-privileged credentials can bypass MFA controls on ADSelfService Plus, gaining unauthorized access to identity-management functionality without completing the second authentication factor.
Affected Products
- Zohocorp ManageEngine ADSelfService Plus versions prior to build 6524
- Deployments relying on the built-in MFA/two-factor authentication feature
- Environments using ADSelfService Plus for Active Directory self-service password reset
Discovery Timeline
- 2026-07-21 - CVE-2026-3183 published to NVD
- 2026-07-21 - Last updated in NVD database
- Advisory - Published by Zohocorp at the ManageEngine Security Advisory
Technical Details for CVE-2026-3183
Vulnerability Analysis
The vulnerability is an Authentication Bypass by Spoofing weakness [CWE-290] in the MFA workflow of ADSelfService Plus. An attacker who already holds valid low-privileged credentials can subvert the MFA verification step and proceed as if the second factor had been successfully validated. Because ADSelfService Plus manages password reset and account unlock operations for Active Directory users, bypassing MFA can be used to alter downstream authentication state for other accounts.
The issue impacts confidentiality and integrity of user account operations while leaving service availability intact. Successful exploitation requires network access to the ADSelfService Plus web interface, which is often exposed to internal users and, in some deployments, to the internet for remote password self-service.
Root Cause
The root cause lies in how ADSelfService Plus verifies that the MFA challenge belongs to and was completed by the authenticating user. The application accepts an authentication state that can be spoofed or replayed, allowing the second-factor gate to be skipped. Zohocorp addressed the flaw in build 6524 by hardening the MFA state validation logic. Refer to the ManageEngine Security Advisory for authoritative technical details.
Attack Vector
Exploitation is performed over the network against the ADSelfService Plus application. An attacker with valid low-privileged credentials interacts with the authentication flow, submits or manipulates the MFA verification step, and completes login without providing a legitimate second factor. No user interaction from the victim is required, and no privileged access is needed to reach the vulnerable code path.
Because no verified public proof-of-concept code is available, exploitation specifics are described in prose only. Consult the vendor advisory for remediation guidance.
Detection Methods for CVE-2026-3183
Indicators of Compromise
- Successful logins to ADSelfService Plus that lack a corresponding MFA challenge success event in the application audit log.
- Repeated authentication attempts from a single source that transition directly from primary credential submission to an authenticated session.
- Password reset or account unlock operations initiated shortly after anomalous logins from unusual IP ranges or geolocations.
Detection Strategies
- Enable and centrally collect ADSelfService Plus audit logs, then correlate primary authentication events with MFA verification events to identify mismatches.
- Monitor the ADSelfService Plus build/version banner and alert when any host reports a build below 6524.
- Baseline normal MFA completion rates per user and flag accounts whose logins consistently skip the second-factor event.
Monitoring Recommendations
- Forward ADSelfService Plus and Active Directory logs into a centralized analytics platform for cross-source correlation.
- Alert on downstream Active Directory password reset and account unlock activity originating from ADSelfService Plus service accounts outside normal patterns.
- Track failed and successful authentication ratios on the ADSelfService Plus portal to detect abuse of low-privileged credentials.
How to Mitigate CVE-2026-3183
Immediate Actions Required
- Upgrade ManageEngine ADSelfService Plus to build 6524 or later as published in the vendor advisory.
- Rotate credentials for any accounts that show anomalous authentication events since the vulnerable build was deployed.
- Restrict network exposure of the ADSelfService Plus portal to trusted networks or a VPN where feasible.
Patch Information
Zohocorp has released a fixed build of ManageEngine ADSelfService Plus that remediates the MFA bypass. Administrators should update to build 6524 or newer. Full remediation guidance is available in the ManageEngine Security Advisory.
Workarounds
- Limit access to the ADSelfService Plus web console using firewall rules or a reverse proxy that enforces IP allowlisting until patching is complete.
- Enforce strong primary credential policies and disable inactive low-privileged accounts that could be leveraged to reach the vulnerable MFA flow.
- Increase log retention and review MFA-related events daily until the upgrade to build 6524 has been verified across all instances.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
