# CVE-2026-44731: OpenProject user enumeration and name disclosure in meetings filter

Source: https://junglewise.ai/threats/cve-2026-44731-openproject-user-enumeration-and-name-disclosure-in-meetings  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-26. Updated: 2026-06-26  
License: CC BY 4.0 with a link back

CVE-2026-44731 · Severity: medium · CVSS 4.3 · Published 2026-06-26

OpenProject is an open-source project management platform used by teams to track tasks and collaborate. A security flaw in the meetings filter feature allows logged-in users to discover the full names of other users and confirm if specific accounts exist. This could be used by an attacker to map out an organization's employee list or prepare for targeted phishing attacks.

Technologies: [OpenProject GmbH OpenProject](https://junglewise.ai/threats/technologies/openproject). Vendors: [OpenProject GmbH](https://junglewise.ai/threats/vendors/openproject-gmbh).

## Quick answers

**Is CVE-2026-44731 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-44731 being exploited in the wild.

**How severe is CVE-2026-44731?** Medium severity, with a CVSS score of 4.3, published 26 June 2026.

**Which products and versions are affected?** OpenProject GmbH OpenProject < 17.3.2, < 17.4.0.

**Is there a fix for CVE-2026-44731?** 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-2026-44731 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-44731?** Check whether you run OpenProject GmbH OpenProject at an affected version. 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 information disclosure vulnerability exists in OpenProject's meetings filter feature due to improper access control (CWE-639). By manipulating the 'invited_user_id' value within the 'filters' GET parameter on the meetings endpoint, an authenticated attacker can probe user IDs. The server's response reveals whether a user ID is valid and discloses the associated user's full name. This allows for full account enumeration of the platform. The issue is fixed in versions 17.3.2 and 17.4.0.

## Affected products

- opf OpenProject < 17.3.2, < 17.4.0

## Timeline

- 2026-05-13: advisory: GitHub Security Advisory published by vendor
- 2026-06-26: disclosed: CVE published to NVD

## References

- [https://github.com/opf/openproject/security/advisories/GHSA-x7j3-cfgf-7mc4](https://github.com/opf/openproject/security/advisories/GHSA-x7j3-cfgf-7mc4)

## Related threats

- [OpenProject Information Disclosure in Time and Cost Entry APIs](https://junglewise.ai/threats/cve-2026-67529-openproject-information-disclosure-in-time-and-cost-entry-apis)
- [OpenProject incorrect authorization in custom options API](https://junglewise.ai/threats/cve-2026-67528-openproject-incorrect-authorization-in-custom-options-api)
- [OpenProject missing authorization in work packages API file links](https://junglewise.ai/threats/cve-2026-67527-openproject-missing-authorization-in-work-packages-api-file-links)
- [OpenProject information disclosure in meeting agenda API](https://junglewise.ai/threats/cve-2026-49355-openproject-information-disclosure-in-meeting-agenda-api)
- [OpenProject Information Disclosure in Relations API Filter](https://junglewise.ai/threats/cve-2026-44736-openproject-information-disclosure-in-relations-api-filter)