CVE-2026-5378: runZero Platform Auth Bypass Vulnerability

CVE-2026-5378 Overview

A significant authorization vulnerability has been identified in the runZero Platform that allowed administrators to create and update users outside of their authorized organization scope. This vulnerability represents an instance of CWE-863: Incorrect Authorization, enabling privilege escalation across organizational boundaries within multi-tenant deployments.

Critical Impact

Administrators can create and update users outside their authorized organization scope, potentially compromising the multi-tenant isolation model and enabling unauthorized cross-organizational access.

Affected Products

• runZero Platform versions prior to 4.0.260203.0

Discovery Timeline

• April 7, 2026 - CVE-2026-5378 published to NVD
• April 8, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5378

Vulnerability Analysis

This authorization bypass vulnerability stems from improper validation of organizational boundaries during user management operations. In multi-tenant environments, the runZero Platform should enforce strict isolation between organizations, ensuring administrators can only manage users within their authorized scope. However, due to insufficient authorization checks in the user creation and update workflows, administrators could perform these operations on users belonging to other organizations.

The vulnerability requires high privileges (administrator access) to exploit and involves high attack complexity, as the attacker must already possess administrative credentials within the platform. However, successful exploitation has a changed scope impact, meaning the vulnerability affects resources beyond the vulnerable component's security scope—specifically, other organizations within the same runZero deployment.

The integrity impact is rated as high because an attacker could create rogue accounts or modify existing users in organizations they should not have access to, potentially enabling further lateral movement or persistent access across organizational boundaries.

Root Cause

The root cause of this vulnerability is CWE-863: Incorrect Authorization. The runZero Platform failed to properly validate organizational scope during user management API calls, allowing authenticated administrators to reference organization identifiers outside their authorized domain when creating or updating user accounts.

Attack Vector

The attack vector is network-based, requiring the attacker to have authenticated administrator-level access to the runZero Platform. An attacker with administrative privileges in one organization could craft API requests that target users in other organizations within the same multi-tenant deployment.

The exploitation scenario involves:

1. An attacker obtaining administrator credentials for Organization A
2. Identifying the organization identifiers or user IDs associated with Organization B
3. Submitting user creation or modification requests that cross organizational boundaries
4. Successfully creating or modifying users in Organization B despite lacking authorization

Since no verified code examples are available, readers should refer to the runZero Security Advisory for detailed technical information about the vulnerability mechanism.

Detection Methods for CVE-2026-5378

Indicators of Compromise

• Unexpected user accounts appearing in organizations without corresponding legitimate creation events
• Audit log entries showing user modifications by administrators from different organizations
• API requests containing organization identifiers that do not match the authenticated administrator's scope
• Unusual patterns of user account creation or modification across organizational boundaries

Detection Strategies

• Review audit logs for user creation and modification events where the acting administrator's organization differs from the target user's organization
• Monitor API calls to user management endpoints for organization identifier mismatches
• Implement alerting on any cross-organizational user management operations
• Correlate administrator authentication events with subsequent user management actions to identify scope violations

Monitoring Recommendations

• Enable comprehensive audit logging for all user management operations within the runZero Platform
• Configure alerts for user creation or modification events that reference organization identifiers outside expected values
• Establish baseline patterns for administrative user management activities and alert on deviations
• Periodically audit user accounts across organizations to identify any unauthorized accounts

How to Mitigate CVE-2026-5378

Immediate Actions Required

• Upgrade to runZero Platform version 4.0.260203.0 or later immediately
• Conduct a comprehensive audit of all user accounts across organizations to identify any unauthorized accounts
• Review audit logs for evidence of cross-organizational user management activity
• Rotate administrator credentials as a precautionary measure if exploitation is suspected

Patch Information

runZero has released version 4.0.260203.0 of the runZero Platform which addresses this authorization vulnerability. Organizations should upgrade to this version or later to remediate the issue. Detailed release notes are available in the runZero Release Notes.

For additional information about this vulnerability, refer to the official runZero Security Advisory for CVE-2026-5378.

Workarounds

• Limit administrator privileges to essential personnel only until the patch can be applied
• Implement network segmentation to restrict access to the runZero Platform management interface
• Enable enhanced audit logging and implement real-time monitoring for user management operations
• Consider temporarily disabling user self-provisioning features if available until the upgrade is complete