CVE-2026-22602CWE-200

OpenProject is Vulnerable to User Enumeration via User ID

Low · published January 10, 2026

CVSS v3.1
3.5
EPSS
0%
Percentile
20.4
In the wild
Unconfirmed
What it is

OpenProject is an open-source, web-based project management software. Prior to version 16.6.2, a low‑privileged logged-in user can view the full names of other users. Since user IDs are assigned sequentially and predictably (e.g., 1 to 1000), an attacker can extract a complete list of all users’ full names by iterating through these URLs. The same behavior can also be reproduced via the OpenProject API, allowing automated retrieval of full names through the API as well. This issue has been patched in version 16.6.2. Those who are unable to upgrade may apply the patch manually.

The record
Technical detail
CVSS v3.1
3.5 · LOW
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00290 · 20.4th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-01-10T01:06Z
EPSS history
Timeline
  • 10 JAN 01:06Z
    OpenProject is Vulnerable to User Enumeration via User ID
    cvelistv5