CVE-2026-39655 in Mayosis Core Plugin
Summary
by MITRE • 05/26/2026
Missing Authorization vulnerability in TeconceTheme Mayosis Core allows Exploiting Incorrectly Configured Access Control Security Levels.
This issue affects Mayosis Core: from n/a through 5.4.7.
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Analysis
by VulDB Data Team • 05/26/2026
The missing authorization vulnerability in TeconceTheme Mayosis Core represents a critical access control flaw that undermines the security posture of affected systems. This vulnerability stems from incorrectly configured access control security levels that fail to properly validate user permissions before granting access to protected resources. The flaw exists within the core framework of the Mayosis Core software, which serves as the foundational component for various web applications and content management systems. Security researchers identified that the system lacks proper authorization checks that should occur at multiple levels of the application architecture. The vulnerability creates a pathway for unauthorized users to bypass normal access controls and gain access to restricted functionality or data that should only be available to authenticated administrators or authorized personnel.
The technical implementation of this flaw manifests through inadequate validation of user roles and permissions within the application's core authorization mechanisms. When users interact with the system, the framework fails to properly verify whether the requesting entity possesses sufficient privileges to perform specific actions or access particular resources. This misconfiguration allows attackers to exploit the system by manipulating request parameters or directly accessing protected endpoints without proper authentication. The vulnerability is particularly concerning because it affects the fundamental security controls that should be in place at the application core level, making it a critical weakness that can be leveraged across multiple attack vectors. The flaw essentially creates a backdoor mechanism where the system's built-in access control enforcement is bypassed entirely, leaving sensitive functionality exposed to malicious actors.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can enable attackers to escalate privileges and potentially compromise entire systems. An attacker who successfully exploits this weakness could gain administrative access to the affected applications, allowing them to modify content, delete data, manipulate user accounts, or even install malicious software. The scope of potential damage increases significantly because the vulnerability affects the core framework rather than isolated components, meaning that any application built on or using the Mayosis Core framework could be compromised. This type of vulnerability aligns with CWE-285, which addresses improper authorization within software systems, and represents a classic example of how weak access control implementations can lead to complete system compromise. Organizations using affected versions of the software face significant risk of data breaches, system compromise, and potential regulatory violations due to the exposure of sensitive information and unauthorized access to critical system functions.
Mitigation strategies for this vulnerability require immediate attention from system administrators and security teams. The primary recommendation involves updating to the latest version of the Mayosis Core framework where the authorization flaw has been patched and properly implemented. Organizations should also conduct comprehensive security assessments to identify any applications or systems that may be vulnerable due to their use of affected versions. Network segmentation and additional access controls should be implemented as temporary measures while permanent fixes are deployed. Security teams should review and audit existing access control configurations to ensure that proper authorization checks are in place across all application components. The implementation of proper logging and monitoring mechanisms becomes crucial to detect potential exploitation attempts. Additionally, organizations should consider implementing defense-in-depth strategies that include web application firewalls, intrusion detection systems, and regular security penetration testing to identify and remediate similar vulnerabilities. This vulnerability demonstrates the critical importance of proper authorization implementation and serves as a reminder of the potential consequences when access control mechanisms fail to function as designed, aligning with ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting through exploitation of weak access controls.