Description

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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.3",
  "pubDate": "2026-09-02T19:18:09.580Z",
  "pubdate": "2026-09-02T19:18:09.580Z",
  "executiveSummary": "A critical security flaw has been identified in the tsi-coop tsi-dpdp-cms software, affecting all versions up to and including 0.5.0.\nThe vulnerability is characterized as an improper implementation of security controls, specifically involving the reliance on client-side logic to enforce server-side security policies.\nThis design flaw allows remote attackers to bypass intended security restrictions, as the client-side environment can be manipulated to circumvent authorization checks or data validation routines that should exclusively reside on the server.\nBecause the exploit is publicly available, the risk of exploitation is elevated. Attackers can leverage this vulnerability to gain unauthorized access or manipulate data within the CMS platform without requiring specialized privileges.\nOrganizations utilizing tsi-dpdp-cms are at risk of data integrity compromise and unauthorized information disclosure due to the client-side enforcement architecture. Immediate action is required to address this exposure.",
  "technicalDetails": "The vulnerability in tsi-dpdp-cms stems from an architectural weakness where security-sensitive decisions—typically reserved for the server-side infrastructure—are delegated to the client-side implementation.\nIn a secure architecture, the server must perform definitive authorization, authentication, and input validation to ensure that security constraints cannot be bypassed by an end-user or an adversary.\nIn the affected versions (up to 0.5.0), the application improperly trusts data, state information, or security directives sent from or managed by the client-side application. This creates a scenario where an attacker, through tools such as web proxies, browser developer tools, or manual HTTP request manipulation, can modify the client-side logic or intercept and alter the communication flow.\nThe attack flow involves the adversary intercepting requests between the client and the server. By manipulating the parameters that govern the client-side enforcement logic, the attacker induces the application to behave as if security policies have been satisfied, despite the server failing to independently verify these policies.\nThis vulnerability is remotely exploitable, meaning the attacker does not require physical access or local network presence. Given that the exploit mechanism has been disclosed publicly, adversaries can systematically identify target installations and perform unauthorized actions that the CMS was intended to prevent.\nThe root cause is the conflation of presentation-layer logic with authorization logic. When critical security checks are performed on the client side, the server effectively abdicates its role as the source of truth, leaving the security model entirely dependent on the integrity of the client, which is under the total control of the user.\nPost-exploitation, an attacker may be able to access restricted administrative functions, alter sensitive configuration data, or bypass content access controls embedded within the tsi-dpdp-cms framework, leading to a complete compromise of the affected installation."
}