Nezha Dashboard Authorization and Resource Exhaustion Vulnerabilities

Executive Summary

CVE-2026-126307 affects Nezha Dashboard versions before 2.6.0. It involves multiple authorization, tenant isolation, and resource exhaustion flaws. Attackers can exploit NAT, DDNS, OAuth, cron, and server transfer features to claim undeclared hostnames, hijack profiles, create unauthorized schedules, or exhaust server memory via buffered NAT requests.

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Detection Guidance

To detect this vulnerability, check if your Nezha Dashboard version is below 2.6.0. Use commands like 'nezha-dashboard --version' or inspect package metadata. Monitor logs for unauthorized access attempts, unusual NAT/DDNS activity, or memory exhaustion patterns. Review cron job configurations for unauthorized schedules.

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Impact Analysis

Unauthenticated attackers or members could capture login data, bypass authentication, escalate privileges, manipulate schedules, or cause denial-of-service by exhausting server resources. Sensitive data like credentials may be exposed in logs, and system integrity could be compromised.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. Exposure of credentials or personal data in logs may result in non-compliance with data protection regulations.

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Mitigation Strategies

Upgrade Nezha Dashboard to version 2.6.0 or later immediately. Review and revoke any unauthorized OAuth bindings, NAT domains, or cron jobs. Implement stricter access controls and monitor for suspicious activity. Follow the official upgrade guide from the project.

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