CVE-2026-103283 in Ghost
Summary
by MITRE • 10/01/2026
Ghost versions 6.20.0 before 6.57.1 contain a session handling vulnerability that allows authenticated staff users to log in as any other staff user with only the password, bypassing two-factor authentication. Attackers with valid staff credentials can exploit improper session management to impersonate other staff members and gain unauthorized access to administrative functions.
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Analysis
by VulDB Data Team • 10/01/2026
The identified security flaw resides within Ghost versions 6.20.0 through 6.57.1 and represents a critical failure in the application's authentication and session management logic. This vulnerability specifically targets authenticated staff users, allowing an attacker who possesses valid credentials for one account to impersonate another staff member by providing only that target user's password. The core of this issue lies in how the system handles session tokens during login attempts when two-factor authentication is enabled or configured as a security requirement. Instead of enforcing strict binding between the authenticated identity and the generated session token, the application exhibits improper session management practices that permit credential substitution without validating the multi-factor challenge against the specific user context being accessed.
From a technical perspective, this vulnerability aligns with CWE-384, which describes Session Fixation, although it manifests more specifically as an authentication bypass due to flawed state machine logic in the login workflow. When a staff member attempts to log in using another staff member's password, the system incorrectly associates the resulting session token with the attacker’s existing active session or fails to invalidate previous sessions properly while creating new ones under the wrong identity. This allows the attacker to maintain their current authenticated context while gaining elevated privileges associated with the target account. The absence of proper re-authentication checks for sensitive administrative actions further exacerbates this risk, as the system trusts the compromised session state without verifying that the user has successfully completed all required authentication steps for that specific role.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and unauthorized access to administrative functions. Staff users typically possess significant control over content management systems, including publishing articles, managing other users, and accessing sensitive site configurations. By bypassing two-factor authentication through session manipulation, an attacker can fully impersonate a colleague with higher privileges, leading to complete compromise of the application's integrity. This could result in data exfiltration, defacement of public-facing content, or installation of persistent backdoors within the platform. The ability to operate undetected under another user’s identity also complicates forensic analysis and audit trail accuracy, as actions performed by the attacker will be attributed to the victimized staff member rather than the actual intruder.
This behavior is consistent with ATT&CK technique T1078, Valid Accounts, where adversaries leverage legitimate credentials to gain initial access or maintain persistence within a network environment. In this context, the exploitation involves lateral movement and privilege escalation by abusing valid session tokens derived from improper handling of multi-factor authentication states. The vulnerability underscores the importance of ensuring that session identifiers are securely generated, bound strictly to the authenticated user identity, and invalidated upon any change in security context or role assumption.
To mitigate this risk, organizations running affected versions must immediately upgrade Ghost to version 6.57.1 or later, where these session handling mechanisms have been corrected. Until an upgrade is feasible, administrators should enforce strict password policies and consider implementing additional layers of authentication such as hardware keys if supported by the current infrastructure. Monitoring user activity logs for anomalies in login patterns, particularly sudden changes in IP addresses or geographic locations associated with staff accounts, can help detect potential exploitation attempts. Furthermore, reviewing access controls to ensure that only necessary personnel have administrative privileges reduces the blast radius should an account be compromised. Regular security audits focusing on session management practices and adherence to OWASP guidelines for authentication will further strengthen defenses against similar vulnerabilities in future updates or related systems.