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CVE-2026-53959— 4gaBoards: Mass Information Disclosure (Internal PII Leakage) on /api/users to any authenticated user

Quick assessment

Affected
RARgames 4gaBoards
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.

RAR 4ga Boards是RAR个人开发者的一款用于实时项目管理的简易看板系统。 RAR 4ga Boards 3.3.9之前版本存在信息泄露漏洞，该漏洞源于users/index和users/show操作仅依赖默认的is-authenticated策略，且返回用户数据时未进行请求者特定授权或响应清理，导致任何经过身份验证的用户可枚举所有用户账户信息并检索任意账户，造成用户枚举、隐私泄露和定向钓鱼侦察。

CVSS 6.5 · Medium EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
RARgames 4gaBoards < 3.3.9 affected
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I. Basic Information for CVE-2026-53959

Vulnerability Information
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Vulnerability Title
4gaBoards: Mass Information Disclosure (Internal PII Leakage) on /api/users to any authenticated user
Source: CVE Program / CVE List V5
Vulnerability Description
4gaBoards is a boards system for realtime project management. Prior to 3.3.9, 4gaBoards allows any authenticated user to enumerate account information for every user through GET /api/users and retrieve arbitrary accounts through GET /api/users/:id. The users/index and users/show actions rely only on the default is-authenticated policy in server/config/policies.js, and server/api/controllers/users/index.js returns the result of sails.helpers.users.getMany() without requester-specific authorization or response sanitization. Responses expose email, phone, organization, name, isAdmin, ssoGoogleEmail, ssoGithubEmail, and other SSO-linked email fields, including data for administrators. This enables instance-wide user enumeration, privacy loss, and targeted phishing reconnaissance. This issue is fixed in version 3.3.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
RAR 4ga Boards 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RAR 4ga Boards是RAR个人开发者的一款用于实时项目管理的简易看板系统。 RAR 4ga Boards 3.3.9之前版本存在信息泄露漏洞，该漏洞源于users/index和users/show操作仅依赖默认的is-authenticated策略，且返回用户数据时未进行请求者特定授权或响应清理，导致任何经过身份验证的用户可枚举所有用户账户信息并检索任意账户，造成用户枚举、隐私泄露和定向钓鱼侦察。
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
RARgames 4gaBoards < 3.3.9 -

II. Public POCs for CVE-2026-53959

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III. Intelligence Information for CVE-2026-53959

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Vendor Advisories for CVE-2026-53959 (1)

Exploits & Public PoCs for CVE-2026-53959 (1)

Same Patch Batch · RARgames · 2026-08-18 · 4 CVEs total

CVE-2026-50191 8.8 HIGH 4gaBoards: Pre-Account Takeover via SSO Email Linkage
CVE-2026-50186 8.8 HIGH 4gaBoards: Path Traversal leading to Arbitrary File Read and Deletion in Board Export
CVE-2026-53958 7.6 HIGH 4gaBoards: SSO Pre-Account Takeover / Hijacking via Mass Assignment

IV. Related Vulnerabilities

Same product: 4gaBoards
Same vendor: RARgames
Same weakness: CWE-200

V. Comments for CVE-2026-53959

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