CVE-2026-5375 Overview
An information disclosure vulnerability has been identified in the runZero Platform that could allow an authenticated user with access to a credential to view sensitive fields through an API response. This vulnerability is classified as CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the API inadvertently returns sensitive credential data that should be masked or excluded from responses.
Critical Impact
Authenticated users with credential access may be able to view sensitive fields that should remain hidden, potentially exposing confidential information stored within the runZero Platform.
Affected Products
- runZero Platform versions prior to 4.0.260203.0
Discovery Timeline
- 2026-04-07 - CVE-2026-5375 published to NVD
- 2026-04-08 - Last updated in NVD database
Technical Details for CVE-2026-5375
Vulnerability Analysis
This vulnerability represents a classic information disclosure issue where the API endpoint responsible for credential management fails to properly sanitize or filter sensitive fields before returning data to the client. When a user with legitimate access to a credential queries the API, the response may contain additional sensitive fields that should not be exposed, even to authorized users.
The root cause lies in improper data handling within the API layer. Rather than implementing a strict allowlist of fields to return, the API appears to serialize the entire credential object, including sensitive internal fields that should remain server-side only.
Root Cause
The vulnerability stems from CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The API response handling logic did not adequately filter or mask sensitive credential fields before transmitting them to authorized users. This type of flaw typically occurs when:
- Object serialization includes all fields by default
- Field-level access controls are not implemented in the response layer
- Sensitive data is not properly marked for exclusion from API responses
Attack Vector
The attack vector is network-based and requires the attacker to have high privileges (authenticated with credential access). An attacker would need to:
- Authenticate to the runZero Platform with valid credentials
- Have existing access to at least one credential object
- Query the API endpoint that returns credential information
- Inspect the API response to extract sensitive fields that should not be visible
The exploitation complexity is low once the attacker has the required privileges. No user interaction is required, and the scope is unchanged (impacts only the vulnerable system). The vulnerability affects confidentiality only, with no impact on integrity or availability.
Detection Methods for CVE-2026-5375
Indicators of Compromise
- Unusual API query patterns targeting credential endpoints from authenticated users
- Unexpected data extraction or exfiltration following credential API access
- Users accessing credential APIs more frequently than their normal operational patterns
- Audit logs showing credential reads that don't correspond to legitimate workflow activities
Detection Strategies
- Monitor API access logs for credential-related endpoints and track response sizes
- Implement anomaly detection for users querying credential APIs outside normal business hours
- Review audit logs for patterns of credential enumeration or bulk API queries
- Compare API access patterns against baseline user behavior profiles
Monitoring Recommendations
- Enable detailed API logging for all credential-related endpoints
- Set up alerts for abnormal credential API access frequency
- Implement data loss prevention (DLP) monitoring on API responses
- Conduct periodic reviews of API access logs as part of security audits
How to Mitigate CVE-2026-5375
Immediate Actions Required
- Upgrade the runZero Platform to version 4.0.260203.0 or later immediately
- Review API access logs for any suspicious credential access patterns prior to patching
- Audit which users have credential access and revoke unnecessary permissions
- Rotate any credentials that may have been exposed through this vulnerability
Patch Information
This issue was fixed in version 4.0.260203.0 of the runZero Platform. For complete details on the fix and upgrade instructions, refer to the RunZero Release Notes. Additional vulnerability details are available in the RunZero Advisory for CVE-2026-5375.
Workarounds
- Restrict API access to credential endpoints to only essential personnel until patching is complete
- Implement network-level controls to limit which systems can access the runZero API
- Consider temporarily disabling API access if not operationally critical
- Apply principle of least privilege by auditing and reducing credential access permissions
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
