Ghost Staff Invitation Race Condition Allows Duplicate Accounts

Executive Summary

This vulnerability is a concurrency issue in Ghost's staff invitation system. It allows attackers to exploit a race condition by sending multiple concurrent requests with the same invitation token. This can create duplicate user accounts from a single token, bypassing intended access controls.

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Detection Guidance

Detecting this vulnerability requires checking Ghost version and monitoring for duplicate accounts. Verify Ghost version with 'ghost version' command. Check for multiple accounts created from the same invite token by reviewing user logs or database entries for duplicate registrations.

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Impact Analysis

An attacker could create multiple unauthorized accounts using a single invitation token. This may lead to unauthorized access to sensitive data, privilege escalation, or misuse of system resources. Organizations using affected Ghost versions risk compromised user management and potential data breaches.

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Compliance Impact

This vulnerability could lead to unauthorized account creation, violating access control requirements in GDPR and HIPAA. It may result in unauthorized data access or processing, potentially causing non-compliance with these regulations' security and accountability mandates.

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Mitigation Strategies

Immediately update Ghost to version 6.23.0 or later. If updating is not possible, disable staff invitation functionality until patched. Review all user accounts for duplicates created via this vulnerability and remove unauthorized accounts.

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