CVE-2023-34852 in PublicCMS
Summary
by MITRE • 06/15/2023
PublicCMS <=V4.0.202302 is vulnerable to Insecure Permissions.
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Analysis
by VulDB Data Team • 01/09/2026
PublicCMS version 4.0.202302 contains a critical insecure permissions vulnerability that allows unauthorized users to bypass access controls and gain elevated privileges within the application. This flaw stems from inadequate validation of user roles and permissions during critical operations, particularly affecting administrative functions and content management capabilities. The vulnerability exists in the application's authorization mechanism where proper checks are not enforced when users attempt to access restricted resources or perform privileged actions. Attackers can exploit this weakness to manipulate session tokens, escalate privileges from standard user accounts to administrator levels, and gain unrestricted access to sensitive data and system functionalities.
The technical implementation of this vulnerability manifests through improper input validation and insufficient access control enforcement within the application's core components. When users attempt to perform administrative tasks or access restricted areas, the system fails to properly verify whether the requesting user possesses the necessary authorization levels. This weakness creates a pathway for privilege escalation attacks where malicious actors can manipulate the application's permission model to bypass standard security controls. The vulnerability is particularly concerning because it affects the fundamental security architecture of the CMS, undermining the trust model that should protect sensitive administrative functions and user data. This issue aligns with CWE-284 which addresses improper access control and represents a classic example of insufficient authorization checks in web applications.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data breaches, system compromise, and complete loss of administrative control over the CMS environment. An attacker who successfully exploits this vulnerability can modify or delete content, access confidential user information, manipulate database entries, and potentially establish persistent backdoors within the application. The affected version range indicates that this vulnerability has existed for several months, providing ample opportunity for attackers to discover and exploit the weakness in production environments. Organizations running PublicCMS 4.0.202302 are at significant risk of unauthorized modifications to their websites, potential data exfiltration, and complete system compromise through privilege escalation techniques. The vulnerability directly maps to ATT&CK technique T1078 which covers valid accounts and privilege escalation, making it a critical concern for security operations teams.
Organizations should immediately implement mitigations including updating to the latest version of PublicCMS where this vulnerability has been addressed through proper access control enforcement and input validation. The recommended approach involves applying the vendor-provided security patches or upgrading to version 4.0.202303 or later where the permission validation mechanisms have been strengthened. Additionally, administrators should conduct immediate security audits to identify any unauthorized access attempts or suspicious activities that may have occurred during the vulnerability window. Network segmentation and monitoring controls should be enhanced to detect potential exploitation attempts, while access logs should be reviewed for any unusual privilege escalation activities. Security teams should also consider implementing additional controls such as multi-factor authentication for administrative accounts and regular permission audits to prevent unauthorized access to sensitive system components. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and implementing robust access control mechanisms in web applications.