CVE-2026-70594 in Ghost
Summary
by MITRE • 08/05/2026
Ghost is a Node.js content management system. From 2.2.0 until 6.54.1, Ghost Admin did not invalidate existing sessions on login which could have allowed for session fixation attacks. Successful exploitation would have required another vulnerability on the same domain where Ghost Admin was hosted. 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 presents a significant authentication vulnerability that spans multiple versions from 2.2.0 through 6.54.1, specifically affecting the Ghost Admin interface. This flaw represents a session management weakness where the system fails to invalidate existing user sessions upon successful authentication, creating a vulnerability that aligns with CWE-613, which addresses insufficient session expiration and invalidation. The vulnerability manifests as a session fixation attack vector, where an attacker who has already established a session can potentially maintain access even after legitimate users log in with new credentials.
The technical implementation of this flaw involves the authentication flow within Ghost Admin not properly handling session lifecycle management during login operations. When a user authenticates successfully, the system should invalidate any previous sessions associated with that user account and establish a fresh session identifier. However, in affected versions, existing session tokens remain valid and active even after new authentication occurs, allowing for potential session hijacking or fixation attacks. This weakness creates a scenario where an attacker who has previously compromised or obtained access to a user session can maintain persistent access despite legitimate users logging in with their own credentials.
The operational impact of this vulnerability extends beyond simple authentication bypass capabilities, as it requires additional conditions for successful exploitation. Specifically, the attack vector necessitates another vulnerability existing on the same domain where Ghost Admin is hosted, creating what security professionals would classify as a chained attack scenario. This dependency means that an attacker must first establish a foothold through some other means such as cross-site scripting or server-side vulnerabilities within the same domain before leveraging the session fixation weakness. The requirement for domain-level vulnerabilities limits the immediate impact but does not eliminate the risk, particularly in environments where multiple applications share the same domain.
This vulnerability directly relates to ATT&CK technique T1563.002, which covers "T1563.002 - Credentials from Password Stores: Securityd Memory," and more broadly addresses session management weaknesses within web applications. The fix implemented in version 6.54.1 addresses the core session invalidation mechanism by ensuring proper session cleanup during authentication processes. Organizations running affected versions should prioritize immediate patching, as the vulnerability creates a persistent access vector that can be exploited even when users change their passwords or log out and back in. The mitigation strategy requires not only updating to version 6.54.1 but also implementing comprehensive session management policies including automatic session timeout mechanisms, secure session cookie attributes, and regular security audits of authentication flows.
The broader implications of this vulnerability highlight the importance of proper session management practices in web applications, particularly those serving administrative interfaces where elevated privileges can be accessed. The flaw demonstrates how seemingly minor implementation details in authentication systems can create significant security risks when combined with other attack vectors within the same environment. This case study reinforces industry best practices for session handling as outlined in OWASP top ten security requirements and emphasizes the necessity of thorough testing of authentication flows to prevent such vulnerabilities from reaching production environments.