CVE-2026-52782Critical· 9.9▾ Midnight

OpenProject is open-source, web-based project management software

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score55/ 100 · Moderate

impact 54.5 · likelihood 0.1 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

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Published

Jun 26, 2026

Updated

Jun 29, 2026

CVSS

9.9

Vendor

—

Product

—

CWE

CWE-639

Depth score

55 · Moderate

EPSS

0.45% · p39

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS history

Exploit-prediction probability, daily snapshots since Jul 4.

0.3% → 0.5%▲ 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 59 days

Jun 26, 2026Published
Disclosed via NVD
Jun 29, 2026Record revised
Last analysed / modified upstream
Jul 4, 2026EPSS first tracked
0.3%
Aug 24, 2026EPSS peak
0.3% → 0.5%

CWE-639 #nvd

Full technical detail▾

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.

References

[email protected] — https://github.com/opf/openproject/security/advisories/GHSA-3vpx-94qx-xpw6

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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