Authentication Bypass in Ghost Staff Invite Acceptance

Executive Summary

Ghost versions before 6.62.0 have an authentication bypass flaw where users can register with any email address when accepting staff invites. This happens because the system does not properly validate email addresses during invite acceptance, allowing attackers to use arbitrary emails or legitimate users to register with unintended providers.

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Detection Guidance

To detect this vulnerability, check Ghost versions before 6.62.0 by running commands like 'ghost version' in the Ghost CLI or inspecting Docker container versions. Look for unauthorized account creations with unexpected email domains in logs.

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Impact Analysis

Attackers could exploit this to gain unauthorized access by accepting leaked invite tokens with their own email addresses. Legitimate users might accidentally register with incorrect email providers, leading to confusion or loss of access to their accounts.

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Mitigation Strategies

Immediately update Ghost to version 6.62.0 or later using Ghost-CLI or Docker. Review recent account registrations for suspicious email addresses and revoke unauthorized access.

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