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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

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

opf openproject是opf的项目管理软件。 OPF OpenProject 17.3.2之前版本存在授权问题漏洞，该漏洞源于meetings filter功能泄露用户有效账户信息和完整姓名，可能导致攻击者通过探测用户ID枚举所有现有账户。

CVSS 4.3 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1087.004 · Cloud Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
opf openproject < 17.3.2 affected
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I. Basic Information for CVE-2026-44731

Vulnerability Information
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Vulnerability Title
OpenProject: Improper Access Control on OpenProject through /projects/[projectName]/meetings via "invited_user_id" in GET parameter "filters" leads to user names disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
OPF OpenProject 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
opf openproject是opf的项目管理软件。 OPF OpenProject 17.3.2之前版本存在授权问题漏洞，该漏洞源于meetings filter功能泄露用户有效账户信息和完整姓名，可能导致攻击者通过探测用户ID枚举所有现有账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opf openproject < 17.3.2 -

II. Public POCs for CVE-2026-44731

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III. Intelligence Information for CVE-2026-44731

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Vendor Advisories for CVE-2026-44731 (1)

Same Patch Batch · opf · 2026-06-26 · 17 CVEs total

CVE-2026-52782 9.9 CRITICAL OpenProject: IDOR through /projects/<A>/settings/project_storages/<A_ps_id> via PATCH para
CVE-2026-52785 9.9 CRITICAL OpenProject: SQL injection in timestamps functionality
CVE-2026-46386 9.9 CRITICAL OpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `S
CVE-2026-52780 9.6 CRITICAL OpenProject: Cache store poisoning leads to Remote Code Execution (RCE)
CVE-2026-52784 8.8 HIGH OpenProject: CSRF on TARGET through /users/:id via POST parameter "user[admin]"
CVE-2026-52783 8.2 HIGH OpenProject: Information Disclosure (cleartext storage of data) on localhost through memca
CVE-2026-47193 7.5 HIGH OpenProject: Journal diff endpoint bypasses object, journal, and field visibility checks
CVE-2026-44734 6.5 MEDIUM OpenProject: Improper Access Control on OpenProject through the POST request to /projects/
CVE-2026-44736 6.5 MEDIUM OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Pa
CVE-2026-44735 6.5 MEDIUM OpenProject: Shares API Information Disclosure
CVE-2026-52781 6.4 MEDIUM OpenProject: Stored XSS on openproject.example.com through /api/v3/projects/{project}/work
CVE-2026-44733 5.9 MEDIUM OpenProject: Business Logic Error on OpenProject through PATCH request to /api/v3/users/me
CVE-2026-44696 5.7 MEDIUM OpenProject: Stored CSS injection via Sanitize::Config::RELAXED[:css] enables phishing ove
CVE-2026-52779 5.4 MEDIUM OpenProject: Cross-project authorization bypass allows deleting public Calendar and Team P
CVE-2026-49355 4.3 MEDIUM OpenProject: Private work package data disclosure through single meeting agenda item API
CVE-2026-44732 4.3 MEDIUM OpenProject: IDOR on OpenProject through /api/v3/documents/{id} via PATCH parameter "proje

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-639

V. Comments for CVE-2026-44731

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