---
id: CVE-2026-52782
title: 'OpenProject is open-source, web-based project management software'
summary: >-
  OpenProject is open-source, web-based project management software. Prior to
  17.3.3 and 17.4.1, there is an IDOR through
  /projects/<A>/settings/project_storages/<A_ps_id> via PATCH parameter
  "storages_project_storage[project_folder_id]" l…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-639
published: '2026-06-26'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52782'
references:
  - url: 'https://github.com/opf/openproject/security/advisories/GHSA-3vpx-94qx-xpw6'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00454
epssPercentile: 0.3678
ingestedAt: '2026-06-29T14:29:18.252Z'
---

## Overview

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through /projects/<A>/settings/project_storages/<A_ps_id> via PATCH parameter "storages_project_storage[project_folder_id]" leads to Access to Unauthorized Resources. A project-admin in one project can hijack the managed Nextcloud or OneDrive folder of another project on the same storage by writing the victim project's project_folder_id into the attacker's Storages::ProjectStorage row. The next managed-folder sync overwrites the ACL on the referenced folder with the attacker project's user list. This vulnerability is fixed in 17.3.3 and 17.4.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.