Medium severity · published Jun 26, 2026
CVE-2026-44731
OpenProject: Improper Access Control on OpenProject through /projects/[projectName]/meetings via "invited_user_id" in GET parameter "filters" leads to user names disclosure
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openproject · opf
< 17.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44731
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44731
github.com
https://github.com/opf/openproject/security/advisories/GHSA-x7j3-cfgf-7mc4
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