CVE-2026-1772 in RTU500 CMU
Summary
by MITRE • 02/24/2026
RTU500 web interface: An unprivileged user can read user management information. The information cannot be accessed via the RTU500 web user interface but requires further tools like browser development utilities to access them without required privileges.
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Analysis
by VulDB Data Team • 02/28/2026
The vulnerability identified as CVE-2026-1772 affects the RTU500 web interface and represents a significant information disclosure flaw that undermines the system's access control mechanisms. This vulnerability allows unprivileged users to obtain sensitive user management information that should remain restricted to authorized personnel only. The flaw exists in the web application's authorization controls, where proper access validation fails to prevent unauthorized data retrieval through alternative means. The vulnerability is particularly concerning because while the information is not directly accessible through the standard web interface, it can be obtained using browser development tools and other auxiliary utilities, indicating a fundamental weakness in the application's security architecture.
The technical implementation of this vulnerability stems from insufficient input validation and access control enforcement within the RTU500 web application. Attackers can leverage browser developer tools such as browser consoles, network monitoring utilities, and API inspection tools to bypass the standard user interface restrictions. This type of vulnerability typically occurs when the web application fails to properly validate user permissions at each access point or when it relies solely on client-side validation without server-side enforcement. The flaw demonstrates a lack of proper authentication and authorization checks that should be implemented at multiple layers of the application architecture. According to CWE classification, this vulnerability aligns with CWE-284 which addresses improper access control, and potentially CWE-20 which covers improper input validation.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with valuable intelligence about user accounts, access levels, and potentially system configurations. An unprivileged user gaining access to user management information could use this data to plan more sophisticated attacks, identify potential targets for privilege escalation, or conduct social engineering operations. The vulnerability affects the confidentiality aspect of the CIA triad, as it allows unauthorized information access that should remain protected. The use of browser development tools to exploit this vulnerability indicates that attackers do not require advanced technical skills or specialized tools, making this vulnerability particularly dangerous as it can be exploited by threat actors with basic web browsing knowledge.
Mitigation strategies for CVE-2026-1772 should focus on implementing robust server-side access controls and authentication mechanisms that do not rely on client-side validation alone. Organizations should enforce proper authorization checks at every point of data access, ensuring that all API endpoints and data retrieval mechanisms validate user permissions before returning any sensitive information. The implementation of proper input sanitization and validation should be coupled with comprehensive logging and monitoring to detect unauthorized access attempts. Security controls should be aligned with NIST SP 800-53 security controls, particularly those related to access control and system and information integrity. Additionally, regular security testing including penetration testing and code reviews should be conducted to identify similar vulnerabilities in the application's architecture. The use of web application firewalls and additional security layers can provide defense-in-depth protection against exploitation attempts. This vulnerability also highlights the importance of implementing proper security training for developers to ensure that access control mechanisms are properly implemented and tested throughout the software development lifecycle.