CVE-2026-52779CWE-639CWE-863

OpenProject: Cross-project authorization bypass allows deleting public Calendar and Team Planner queries from unauthorized projects

Medium · published June 26, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
22.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00312 · 22.9th percentile
Weaknesses
CWE-639 · Authorization Bypass Through User-Controlled Key; CWE-863 · Incorrect Authorization
Published
2026-06-26T19:02Z
EPSS history
Timeline
  • 26 JUN 19:02Z
    OpenProject: Cross-project authorization bypass allows deleting public Calendar and Team Planner queries from unauthorized projects
    cvelistv5