CVE-2025-39434 in Avatar Plugin
Summary
by MITRE • 04/17/2025
Authorization Bypass Through User-Controlled Key vulnerability in Scott Taylor Avatar allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Avatar: from n/a through 0.1.4.
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Analysis
by VulDB Data Team • 04/17/2025
The vulnerability identified as CVE-2025-39434 represents a critical authorization bypass flaw within the Scott Taylor Avatar plugin, specifically manifesting as an incorrectly configured access control security level that can be exploited through user-controlled key manipulation. This issue stems from improper validation mechanisms that fail to adequately verify user permissions before granting access to restricted resources or functionality. The vulnerability exists within the plugin's authentication framework where a malicious actor can manipulate input parameters to bypass intended access controls and gain unauthorized privileges. The affected version range spans from n/a through 0.1.4, indicating that all versions within this spectrum are potentially vulnerable to exploitation. This authorization bypass vulnerability falls under the CWE-285 category of Improper Authorization, which specifically addresses scenarios where systems fail to properly enforce access control policies. The flaw enables attackers to escalate their privileges by exploiting the plugin's failure to validate user credentials or roles against the intended access control matrix.
The technical implementation of this vulnerability occurs when the Avatar plugin processes user-controlled input parameters that should normally be restricted to authorized users only. Attackers can manipulate these parameters to assume the identity of other users or access administrative functions without proper authentication. The vulnerability exploits the plugin's trust in user-supplied data without sufficient validation of the controlling key or token that should govern access permissions. This misconfiguration creates a pathway for privilege escalation where unauthorized users can access resources that should be restricted to specific user roles or administrative levels. The flaw operates at the application layer where access control decisions are made, allowing attackers to bypass the intended security boundaries through manipulation of the key-based authorization mechanism. From an attack perspective, this vulnerability aligns with ATT&CK technique T1078.004 which involves valid accounts and credential access through the exploitation of improperly configured access controls.
The operational impact of CVE-2025-39434 extends beyond simple unauthorized access to encompass potential data breaches, system compromise, and privilege escalation to administrative levels. Organizations using affected versions of the Scott Taylor Avatar plugin face significant risk of unauthorized modification of user data, access to sensitive system information, and potential lateral movement within their network infrastructure. The vulnerability can enable attackers to manipulate user profiles, access restricted content, or perform administrative actions that should only be available to authorized personnel. This authorization bypass can lead to complete system compromise if the affected plugin interfaces with critical system functions or databases. The impact is particularly concerning given that the vulnerability affects multiple versions within the specified range, suggesting a fundamental flaw in the plugin's access control implementation rather than a single point of failure. Security teams must consider the potential for cascading effects where this vulnerability serves as a foothold for more extensive attacks within the affected environment.
Mitigation strategies for CVE-2025-39434 require immediate action to address the root cause of the authorization bypass vulnerability. The most effective approach involves updating to the latest version of the Scott Taylor Avatar plugin where the access control mechanisms have been properly implemented and validated. Organizations should implement comprehensive input validation and sanitization measures to prevent user-controlled parameters from influencing access control decisions. Security configurations should enforce strict validation of all access control tokens and keys before granting privileges, implementing proper session management and authentication verification processes. Network segmentation and least privilege principles should be enforced to limit the potential impact of successful exploitation. Regular security audits and penetration testing should be conducted to identify similar misconfigurations in other system components. The implementation of web application firewalls and intrusion detection systems can help monitor for exploitation attempts targeting this specific vulnerability pattern. Additionally, organizations should establish proper change management processes to ensure that access control configurations are properly reviewed and validated during system updates and modifications. The vulnerability highlights the importance of adhering to security best practices as outlined in industry standards including the OWASP Top Ten and NIST cybersecurity frameworks for preventing authorization bypass scenarios.