CVE-2026-44731: Opf Openproject

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

OpenProject is open-source, web-based project management software. Prior to 17.3.2 and 17.4.0, the web application's meetings filter feature leaks whether a given user ID corresponds to a valid account and discloses the user's full name, allowing an attacker to enumerate all existing user accounts by probing user IDs and observing differences in the server response. This vulnerability is fixed in 17.3.2 and 17.4.0.

Affected products

• Opf Openproject: before 17.3.2 (fixed in 17.3.2)

Published 2026-06-26. Last modified 2026-06-29.