CVE-2026-84841 in tsi-dpdp-cms
Summary
by MITRE • 09/02/2026
A security flaw has been discovered in tsi-coop tsi-dpdp-cms up to 0.5.0. This vulnerability affects unknown code. The manipulation results in client-side enforcement of server-side security. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 0.5.1 is able to resolve this issue. It is recommended to upgrade the affected component.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/02/2026
The tsi-coop tsi-dpdp-cms software, specifically versions up through 0.5.0, contains a critical security vulnerability rooted in improper access control mechanisms that allow for client-side enforcement of server-side security policies. This architectural flaw represents a fundamental misunderstanding or misimplementation of the separation between trusted and untrusted environments within the application logic. In secure system design, all authorization decisions must be made on the server side after validating the request against established policy definitions. However, in this affected version, the client component is permitted to dictate security outcomes that should strictly remain under server-side jurisdiction. This deviation from standard security architecture principles creates a significant attack surface where malicious actors can bypass intended restrictions by manipulating local state or request parameters rather than interacting with the actual authorization logic on the backend infrastructure.
From a technical perspective, this vulnerability aligns closely with CWE-284, which describes Improper Access Control, and more specifically reflects patterns associated with client-side enforcement of security controls. The core issue lies in the reliance on client-provided data to determine access rights or operational permissions without sufficient validation against server-stored policies. An attacker can exploit this by crafting specific requests that signal elevated privileges or altered states to the application interface. Because the system trusts these client signals for critical security decisions, it may grant unauthorized actions such as accessing restricted resources, modifying sensitive data, or executing administrative functions. This type of flaw is particularly dangerous because it undermines the integrity of the entire authentication and authorization framework, effectively rendering identity verification meaningless if the subsequent access checks are compromised by client manipulation.
The operational impact of this vulnerability is severe due to its remote exploitability. Since the attack can be launched remotely over a network connection, an unauthenticated or authenticated attacker with basic networking capabilities can target vulnerable instances without needing physical proximity or local system access. The fact that public exploits have been released significantly increases the risk landscape, as automated scanning tools and malicious actors can readily leverage these proof-of-concept codes to identify and compromise susceptible systems at scale. Successful exploitation could lead to unauthorized data exposure, integrity violations where critical records are altered or deleted, and potential privilege escalation within the application context. For organizations relying on tsi-dpdp-cms for managing digital personal data protection compliance, such a breach could result in significant regulatory penalties under frameworks like GDPR due to the compromise of sensitive user information and failure to maintain adequate security controls.
To mitigate this risk, immediate remediation is required by upgrading the affected component to version 0.5.1 or later, where these access control logic errors have been corrected. The updated release ensures that all authorization decisions are strictly enforced on the server side, independent of client-supplied inputs regarding permissions. In addition to applying the software patch, organizations should implement defense-in-depth strategies such as strict input validation and parameterized queries to prevent other related injection attacks. Monitoring logs for anomalous request patterns indicative of access control bypass attempts can also provide early warning indicators of exploitation activity. Regular security assessments and penetration testing focused on authorization flows are recommended to ensure that no similar architectural weaknesses exist in adjacent modules or future updates, thereby maintaining a robust posture against evolving threat vectors targeting web application logic flaws.