CVE-2026-44731CWE-639

OpenProject: Improper Access Control on OpenProject through /projects/[projectName]/meetings via "invited_user_id" in GET parameter "filters" leads to user names disclosure

Medium · published June 26, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
20.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00294 · 20.8th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-06-26T19:41Z
EPSS history
Timeline
  • 26 JUN 19:41Z
    OpenProject: Improper Access Control on OpenProject through /projects/[projectName]/meetings via "invited_user_id" in GET parameter "filters" leads to user names disclosure
    cvelistv5