CVE-2026-52779
Description
OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, a cross-project IDOR / authorization context confusion in the Calendar and Team Planner modules allows a user with management permissions in one project to delete public Calendar or Team Planner Queries from another project where they do not have the corresponding management permissions. Both modules authorize the request against the project identified by :project_id in the URL, but the actual Query object is loaded later by :id from Query.visible(current_user) without verifying that the loaded Query belongs to the authorized project. As a result, an attacker can use permissions from Project A to delete shared/public Calendar or Team Planner views from Project B, causing integrity impact and limited availability impact for users relying on those shared views. This vulnerability is fixed in 17.3.3 and 17.4.1.
Summary dbcve.org
This is an IDOR (Insecure Direct Object Reference) vulnerability in OpenProject's Calendar and Team Planner modules where the authorization check uses the project ID from the URL, but the actual Query object is loaded by a separate ID without verifying it belongs to that project. A user with management permissions in one project can delete public/shared Calendar or Team Planner queries from another project where they lack permissions.
Mitigation
Upgrade to OpenProject version 17.3.3 or 17.4.1 which contains the patch for this authorization bypass vulnerability.