CVE-2025-53895 in Zitadel
Summary
by MITRE • 07/15/2025
ZITADEL is an open source identity management system. Starting in version 2.53.0 and prior to versions 4.0.0-rc.2, 3.3.2, 2.71.13, and 2.70.14, vulnerability in ZITADEL's session management API allows any authenticated user to update a session if they know its ID, due to a missing permission check. This flaw enables session hijacking, allowing an attacker to impersonate another user and access sensitive resources. Versions prior to `2.53.0` are not affected, as they required the session token for updates. Versions 4.0.0-rc.2, 3.3.2, 2.71.13, and 2.70.14 fix the issue.
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Analysis
by VulDB Data Team • 07/15/2025
The vulnerability identified as CVE-2025-53895 affects ZITADEL, an open source identity management system that provides authentication and authorization services for applications and users. This issue represents a critical access control flaw that undermines the security of the session management functionality within the platform. The vulnerability specifically targets the session management API component, which is fundamental to maintaining user authentication state and ensuring proper authorization controls throughout the system. Organizations relying on ZITADEL for identity management face significant risks due to this flaw that could compromise user sessions and lead to unauthorized access to protected resources.
The technical root cause of this vulnerability stems from a missing permission check within ZITADEL's session management API implementation. Prior to version 2.53.0, the system required session tokens for any session updates, providing adequate protection against unauthorized modifications. However, starting with version 2.53.0, the developers introduced a change that removed this essential authorization check, allowing any authenticated user to modify sessions simply by knowing the session identifier. This represents a classic privilege escalation vulnerability where legitimate users can leverage their authentication status to perform actions outside their intended authorization scope. The flaw operates at the API level where session update requests bypass proper access control validation, creating an attack vector that directly violates fundamental security principles of least privilege and proper authorization enforcement.
The operational impact of this vulnerability is severe and far-reaching for organizations using affected ZITADEL versions. An attacker who gains access to a valid session ID can hijack that session and impersonate the legitimate user, potentially gaining access to sensitive data, performing unauthorized transactions, or executing actions within the application that the original user is authorized to perform. This session hijacking capability enables attackers to escalate their privileges without needing additional credentials or complex attack vectors. The vulnerability affects all authenticated users within the system, meaning that any user with valid login credentials could potentially target other users' sessions, creating a widespread security risk that could compromise entire user bases. This flaw directly maps to CWE-285 (Improper Authorization) and aligns with ATT&CK technique T1548.001 (Abuse Elevation Control Mechanism) through unauthorized session manipulation.
Organizations utilizing ZITADEL should immediately upgrade to patched versions 4.0.0-rc.2, 3.3.2, 2.71.13, or 2.70.14 to remediate this vulnerability. The upgrade process should include comprehensive testing to ensure that existing session management functionality continues to operate correctly while properly enforcing authorization controls. System administrators should also implement monitoring solutions to detect potential exploitation attempts, such as unusual session update patterns or unauthorized access attempts. Additionally, organizations should conduct thorough security assessments of their ZITADEL implementations to identify any potential session hijacking that may have already occurred during the vulnerable period. The vulnerability demonstrates the critical importance of maintaining proper authorization controls in authentication systems and highlights the need for comprehensive security testing, particularly around session management APIs where privilege escalation attacks can have devastating consequences. Organizations should also consider implementing additional security measures such as session token rotation, enhanced monitoring of session management activities, and regular security audits of identity management systems to prevent similar vulnerabilities from emerging in the future.