CVE-2026-1497: Neo4j Enterprise Auth Bypass Vulnerability

CVE-2026-1497 Overview

CVE-2026-1497 is an Improper Authorization vulnerability in Neo4j Enterprise edition that arises from incorrect namespace resolution in composite databases. When administrators attempt to grant users access to a remote database constituent using the namespace.name format, the system incorrectly resolves the namespace, inadvertently granting access to any local database or remote alias with the same "name" component. This flaw can lead to unintended privilege assignments, either immediately or when matching databases are created in the future.

Critical Impact

Administrators may unknowingly grant broader database access than intended, potentially exposing sensitive data or allowing unauthorized modifications to local databases or remote aliases that share the same name component.

Affected Products

• Neo4j Enterprise edition versions prior to 2026.02
• Neo4j Enterprise edition versions prior to 5.26.22

Discovery Timeline

• 2026-03-11 - CVE CVE-2026-1497 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2026-1497

Vulnerability Analysis

This vulnerability stems from improper authorization handling (CWE-863) in Neo4j's composite database architecture. When an administrator configures access control for remote database constituents using fully qualified namespace identifiers (e.g., namespace.name), the permission resolution logic fails to properly validate the complete namespace path. Instead, it matches only the terminal name component, leading to overly permissive access grants.

The security implications extend beyond immediate access violations. If a matching local database or remote alias doesn't exist at the time the privilege command is executed, the incorrectly scoped privileges remain dormant until a matching resource is created. This creates a latent security risk where future database or alias creation can unexpectedly inherit elevated privileges.

Root Cause

The root cause lies in Neo4j's namespace resolution logic for composite databases. The system fails to enforce strict namespace boundaries when processing access control commands. Rather than requiring an exact match of the full namespace.name path, the authorization mechanism performs a partial match on only the name portion, bypassing the intended namespace isolation.

Attack Vector

The attack vector requires an attacker to have some level of existing access to the Neo4j environment. Exploitation occurs through the following scenario:

1. An administrator intends to grant a user access to a specific remote database constituent using the qualified path namespace.name
2. Due to the namespace resolution flaw, the permission applies to any database or alias simply named name
3. If an attacker can create or already has access to a local database or alias matching just the name component, they gain unintended access
4. The vulnerability requires user interaction (administrative action) and specific preconditions (presence of the attacker-controlled resource)

The vulnerability is exploitable over the network since Neo4j database administration typically occurs via network connections. However, successful exploitation requires the attacker to position themselves to benefit from the misconfigured permissions, limiting the practical impact.

Detection Methods for CVE-2026-1497

Indicators of Compromise

• Unexpected database access patterns from users who should only have permissions to remote database constituents
• Privilege assignments that reference namespace.name patterns in access control configurations
• Database access logs showing users connecting to local databases when their permissions were intended only for remote constituents

Detection Strategies

• Audit all GRANT statements in Neo4j that use dot-notation (namespace.name) for composite database access
• Review privilege assignments to identify any that may have been affected by incorrect namespace resolution
• Compare intended access control policies against actual effective permissions for all users with composite database access

Monitoring Recommendations

• Implement logging for all database access operations, particularly for local databases and remote aliases
• Monitor for creation of new databases or aliases that may match existing permission patterns
• Set up alerts for access to databases by users whose explicit permissions reference different namespaces

How to Mitigate CVE-2026-1497

Immediate Actions Required

• Upgrade Neo4j Enterprise edition to version 2026.02 or later
• For Neo4j 5.x installations, upgrade to version 5.26.22 or later
• Audit existing privilege assignments that use composite database namespace notation to identify potentially affected configurations
• Review and revoke any unintended access grants resulting from the namespace resolution flaw

Patch Information

Neo4j has released security updates addressing this vulnerability. Organizations should upgrade to Neo4j Enterprise edition version 2026.02 or version 5.26.22 depending on their deployment track. The patch corrects the namespace resolution logic to require exact matches on fully qualified database paths in composite database environments.

For complete patch details and upgrade instructions, refer to the Neo4j Security Advisory for CVE-2026-1497.

Workarounds

• Avoid using composite database namespace notation until patches can be applied
• Manually verify effective permissions after granting access to composite database constituents
• Implement additional access control layers outside of Neo4j's built-in permission system
• Restrict database and alias creation privileges to prevent exploitation through future resource creation