CVE-2026-70589 in Ghost
Summary
by MITRE • 08/05/2026
Ghost is a Node.js content management system. From 4.22.0 until 6.54.1, a missing validation check allowed users to redeem subscription offers that were no longer active. This issue is fixed in version 6.54.1.
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Analysis
by VulDB Data Team • 08/05/2026
The Ghost content management system suffered from a critical business logic vulnerability that persisted across multiple versions from 4.22.0 through 6.54.1. This flaw represented a significant security weakness in the subscription offer redemption mechanism, where the system failed to properly validate whether promotional offers remained active before processing user requests. The vulnerability stemmed from inadequate input validation and state checking procedures within the subscription management module, allowing unauthorized users to exploit expired or disabled promotional campaigns.
From a technical perspective, this vulnerability manifested as a missing validation check that should have verified offer expiration dates, status flags, and active campaign indicators before permitting redemption. The flaw likely occurred in the backend processing logic where user requests for subscription offers were handled without proper authorization and validity checks. This type of vulnerability aligns with CWE-20: Improper Input Validation, which occurs when applications fail to validate input data properly, allowing malicious or unauthorized operations to proceed.
The operational impact of this vulnerability was substantial as it enabled potential attackers or authorized users to redeem subscription offers that had been intentionally disabled or expired. This could result in significant financial losses for the Ghost organization through unauthorized access to premium features or services at reduced or no cost. The vulnerability also posed risks to business integrity and user trust, as it allowed manipulation of the subscription ecosystem and potentially enabled privilege escalation or resource abuse scenarios.
The fix implemented in version 6.54.1 addressed this issue by reintroducing proper validation checks within the subscription offer redemption process. This remediation likely involved adding comprehensive state verification before processing any redemption requests, ensuring that only currently active offers could be utilized. The solution would have incorporated proper business logic controls to validate campaign status, expiration dates, and user authorization levels before permitting any transactional operations.
This vulnerability demonstrates the importance of robust validation mechanisms in subscription-based systems and aligns with ATT&CK technique T1078: Valid Accounts, as it could potentially be exploited by users who gain access to valid accounts but attempt to abuse system features through improper validation checks. Organizations using Ghost or similar content management platforms should ensure they have updated to version 6.54.1 or later and implement proper monitoring of subscription-related activities to detect any potential exploitation attempts. The incident underscores the critical need for continuous security testing and validation of business logic flows in web applications, particularly those handling financial transactions or subscription services, as these components often represent high-value targets for attackers seeking to exploit operational weaknesses.