CVE-2026-53949 in Ghost
Summary
by MITRE • 06/24/2026
Ghost is a Node.js content management system. From 5.46.1 until 6.21.2, the validation applied to filters on the public API endpoints could be partially bypassed, making it possible to reveal private fields via a brute force attack. If SQLite was used as the database password hashes were fully accessible. If MySQL was used as the database the password hashes' case (uppercase / lowercase) would have been lost, which would likely have rendered a further brute force attack on the discovered hashes fruitless. This vulnerability is fixed in 6.21.2.
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Analysis
by VulDB Data Team • 08/05/2026
The Ghost content management system suffered from a critical validation bypass vulnerability affecting versions 5.46.1 through 6.21.2 that compromised the security of public API endpoints. This flaw allowed attackers to exploit filter validation mechanisms, enabling unauthorized access to private data through systematic brute force techniques. The vulnerability specifically targeted the input sanitization processes that should have prevented malicious filter parameters from being processed, creating a pathway for information disclosure that directly violated fundamental security principles of data protection and access control.
The technical implementation of this vulnerability stemmed from inadequate filter validation logic within the public API layer where the system failed to properly sanitize user-supplied filter parameters. This weakness created an attack surface where malicious actors could craft specific requests that would bypass intended access controls, allowing them to extract private fields that should have remained hidden from public view. The flaw aligns with CWE-20, which addresses improper input validation, and represents a classic case of insufficient sanitization leading to information disclosure through unauthorized data access patterns.
The operational impact of this vulnerability extended beyond simple information disclosure, particularly when considering the database backend configurations. When SQLite was configured as the database system, the vulnerability became especially severe as it granted full access to password hash values without any obfuscation or protection mechanisms. This scenario directly violates security best practices outlined in NIST SP 800-63B regarding password storage and handling. However, when MySQL was used as the backend, while the password hashes remained accessible, the case sensitivity information was lost during the processing, effectively nullifying the value of any subsequent brute force attempts against the discovered hashes.
The exploitation of this vulnerability required systematic brute force approaches to identify which private fields could be accessed through the bypassed validation mechanisms. Attackers would have needed to iterate through various filter parameters and observe response patterns to determine what data remained accessible. This type of attack pattern aligns with ATT&CK technique T1213.002, which covers data from information repositories, and demonstrates how insufficient input validation can create opportunities for unauthorized data extraction. The vulnerability's resolution in version 6.21.2 involved implementing stricter filter validation mechanisms and enhanced sanitization processes that properly enforce access control boundaries.
Organizations using affected Ghost versions should immediately implement the patched release and conduct thorough security assessments of their content management systems. The fix addresses both the validation bypass issue and the underlying architectural weakness that allowed the information disclosure to occur in the first place. Security teams should also review their database configurations and ensure proper access controls are implemented at all levels of the system architecture to prevent similar vulnerabilities from manifesting in other components of their technology stack.