Is CVE-2026-52782 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-52782 being exploited in the wild.

How severe is CVE-2026-52782?

Critical severity, with a CVSS score of 9.9, published 26 June 2026.

Which products and versions are affected?

opf OpenProject = 17.4.0 < 17.4.1.

Is there a fix for CVE-2026-52782?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-52782 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-52782?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-52782: OpenProject IDOR in project storage settings

Q: Is there a fix for CVE-2026-52782?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-52782 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-52782?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-52782 · Severity: critical · CVSS 9.9 · Published 2026-06-26

OpenProject is a web-based project management platform used to coordinate tasks and store project documentation. A security flaw allows a project administrator to take control of external storage folders (such as Nextcloud or OneDrive) belonging to other projects. This could lead to unauthorized access to sensitive project files and the potential for data theft or modification across the entire organization.

Quick answers

Is CVE-2026-52782 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-52782 being exploited in the wild.
How severe is CVE-2026-52782?: Critical severity, with a CVSS score of 9.9, published 26 June 2026.
Which products and versions are affected?: opf OpenProject < 17.3.3, >= 17.4.0 < 17.4.1.
Is there a fix for CVE-2026-52782?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-52782 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-52782?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An Insecure Direct Object Reference (IDOR) exists in OpenProject's project storage settings. By sending a PATCH request to the /projects/<A>/settings/project_storages/<A_ps_id> endpoint, an authenticated project administrator can modify the 'project_folder_id' parameter to point to a folder belonging to a different project. When the next managed-folder synchronization occurs, the system overwrites the Access Control List (ACL) of the victim's folder with the attacker's project user list. This allows the attacker to hijack managed Nextcloud or OneDrive folders. The vulnerability is fixed in versions 17.3.3 and 17.4.1.

Affected products

opf OpenProject < 17.3.3, >= 17.4.0 < 17.4.1

Timeline

2026-06-08: advisory: GitHub Advisory GHSA-3vpx-94qx-xpw6 published
2026-06-26: disclosed: CVE-2026-52782 published to NVD

References

https://github.com/opf/openproject/security/advisories/GHSA-3vpx-94qx-xpw6

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