CVE-2026-103273 in Ghost
Summary
by MITRE • 10/01/2026
Ghost versions 4.3.0 before 6.58.0 contain an authentication bypass vulnerability where lower-privilege staff users can use staff tokens to bypass post editing restrictions. Attackers with staff credentials can leverage tokens to edit posts beyond their assigned privilege level.
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Analysis
by VulDB Data Team • 10/01/2026
The Ghost content management system, specifically versions ranging from 4.3.0 up to but not including 6.58.0, contains a critical authentication and authorization flaw that allows for the bypass of post editing restrictions. This vulnerability stems from an improper implementation of access control mechanisms within the application's API layer. The core issue lies in how the system validates staff tokens against user privilege levels when processing requests to modify content. Instead of strictly enforcing role-based permissions at the point of action, the validation logic fails to adequately distinguish between different tiers of administrative privileges during token verification for specific endpoints related to post management.
This technical flaw enables attackers who possess valid credentials for a lower-privilege staff account to exploit the system's trust in the authentication token itself rather than its associated role constraints. By leveraging these tokens, an attacker can send crafted requests that manipulate the backend logic into treating their low-level access as equivalent to higher-level administrative privileges. Consequently, users with limited rights are able to edit posts they should not have permission to modify, effectively bypassing the intended security boundaries designed to protect content integrity and prevent unauthorized changes by less trusted personnel.
The operational impact of this vulnerability is significant for organizations relying on Ghost for multi-author publishing environments where strict editorial workflows and role segregation are required. Attackers can alter published articles, inject malicious code into post bodies, or modify metadata in ways that could lead to defacement, data integrity loss, or further exploitation through stored cross-site scripting if the content management interface is not sufficiently sanitized. This undermines the principle of least privilege, allowing a compromised low-level account to perform actions typically reserved for editors or administrators, thereby escalating their influence over the platform's content and potentially exposing sensitive information or disrupting business operations.
From a classification perspective, this vulnerability aligns with CWE-269, which denotes Improper Privilege Control, as it involves an actor obtaining privileges they are not authorized to have. It also relates to CWE-862, Missing Authorization, because the application fails to enforce proper access control checks for specific resources based on user roles. In terms of offensive security frameworks such as MITRE ATT&CK, this behavior corresponds to techniques involving Privilege Escalation and potentially Account Manipulation if the attacker uses these elevated permissions to create new accounts or modify existing ones to maintain persistence within the compromised environment.
To mitigate this risk, administrators must immediately upgrade Ghost to version 6.58.0 or later, where the access control logic has been corrected to properly validate staff tokens against their assigned privilege levels before allowing post editing operations. Until an update is applied, organizations should implement network-level controls such as web application firewalls that can detect and block anomalous API requests attempting to modify content with mismatched role attributes. Additionally, enforcing strict monitoring of administrative actions and reviewing audit logs for unusual activity patterns associated with lower-privilege accounts can help in early detection of exploitation attempts while the patch is being deployed across affected systems.