CVE-2023-0734 in wallabag
Summary
by MITRE • 03/05/2023
Improper Authorization in GitHub repository wallabag/wallabag prior to 2.5.4.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2023-0734 represents a critical improper authorization flaw within the wallabag repository management system, specifically affecting versions prior to 2.5.4. This issue stems from inadequate access control mechanisms that allow unauthorized users to bypass authentication checks and gain elevated privileges within the application environment. The flaw exists in the repository's permission handling logic, where proper validation of user credentials and role-based access controls are not consistently enforced during critical operations.
This authorization bypass vulnerability falls under the CWE-285 category, which specifically addresses improper authorization conditions in software systems. The technical implementation defect occurs when the application fails to properly verify user permissions before executing sensitive operations, enabling malicious actors to perform actions they should not be authorized to carry out. The vulnerability manifests when users with insufficient privileges attempt to access administrative functions or modify protected resources without proper authentication.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially enabling attackers to compromise the entire repository management system. An attacker exploiting this flaw could gain read access to sensitive data, modify repository configurations, manipulate user permissions, or even execute arbitrary code within the application environment. The vulnerability affects the integrity and confidentiality of the wallabag system, potentially exposing all stored articles, user credentials, and system configurations to unauthorized parties.
From an attack perspective, this vulnerability aligns with several MITRE ATT&CK techniques including privilege escalation and credential access. The flaw allows adversaries to move laterally within the system once initial access is obtained, potentially escalating their privileges to administrative levels. Organizations using affected versions of wallabag face significant risk of data breaches and system compromise, particularly in environments where the application handles sensitive user information or serves as a central repository for important documents.
The recommended mitigation strategy involves immediate deployment of the patched version 2.5.4 or later, which implements proper authorization checks and strengthens the permission validation mechanisms. System administrators should also conduct comprehensive security audits to identify any potential compromise indicators and review access logs for suspicious activities. Additional protective measures include implementing network segmentation, enforcing multi-factor authentication, and establishing regular security monitoring procedures to detect and respond to unauthorized access attempts. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates across all affected systems.