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CVE-2026-50191— 4gaBoards: Pre-Account Takeover via SSO Email Linkage

Quick assessment

Affected
RARgames 4gaBoards
Exploitation
Public or AI PoC available; prioritize validation
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 3.3.8之前版本存在授权问题漏洞，该漏洞源于注册和SSO配置存在缺陷，允许攻击者使用受害者邮箱创建未验证的本地账户并通过SSO登录链接身份，可能导致账户接管、获取受害者项目和数据。

CVSS 8.8 · High EPSS 0.33% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
RARgames 4gaBoards < 3.3.8 affected
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I. Basic Information for CVE-2026-50191

Vulnerability Information
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Vulnerability Title
4gaBoards: Pre-Account Takeover via SSO Email Linkage
Source: CVE Program / CVE List V5
Vulnerability Description
4gaBoards is a boards system for realtime project management. Prior to 3.3.8, 4gaBoards is vulnerable to pre-account takeover when registrationEnabled, localRegistrationEnabled, and ssoRegistrationEnabled are enabled and Google, GitHub, Microsoft, or OIDC SSO is configured. The POST /api/register endpoint permits creation of an unverified local account with a victim's email address, and POST /api/access-tokens permits that account to authenticate while isVerified is false. During the victim's first SSO login, server/api/helpers/users/get-create-one-for-github-sso.js, server/api/helpers/users/get-create-one-for-google-sso.js, server/api/helpers/users/get-create-one-for-microsoft-sso.js, and server/api/helpers/users/get-create-one-for-oidc-sso.js find the attacker-controlled account by email and link the verified SSO identity without confirming ownership of the local account. The attacker can retain local-password access to the linked account and obtain the victim's projects, data, and permissions. This issue is fixed in version 3.3.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
RAR 4ga Boards 授权问题漏洞
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 3.3.8之前版本存在授权问题漏洞，该漏洞源于注册和SSO配置存在缺陷，允许攻击者使用受害者邮箱创建未验证的本地账户并通过SSO登录链接身份，可能导致账户接管、获取受害者项目和数据。
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 < 3.3.8 -

II. Public POCs for CVE-2026-50191

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Qwen3.6-35B-A3B · 8180 chars
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III. Intelligence Information for CVE-2026-50191

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Patches & Fixes for CVE-2026-50191 (1)

Vendor Advisories for CVE-2026-50191 (1)

Other References for CVE-2026-50191 (1)

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

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
CVE-2026-53959 6.5 MEDIUM 4gaBoards: Mass Information Disclosure (Internal PII Leakage) on /api/users to any authent

IV. Related Vulnerabilities

Same product: 4gaBoards
Same vendor: RARgames
Same weakness: CWE-287

V. Comments for CVE-2026-50191

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