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CVE-2026-53958— 4gaBoards: SSO Pre-Account Takeover / Hijacking via Mass Assignment

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 3.3.9之前版本存在安全漏洞，该漏洞源于用户更新接口中未正确限制后端身份属性的批量分配，可能导致经过身份验证的攻击者修改账户的SSO身份标识，使受害者的首次SSO登录匹配到攻击者控制的账户，进而造成账户接管及数据泄露。

CVSS 7.6 · High EPSS 0.28% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
RARgames 4gaBoards < 3.3.9 affected
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I. Basic Information for CVE-2026-53958

Vulnerability Information
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Vulnerability Title
4gaBoards: SSO Pre-Account Takeover / Hijacking via Mass Assignment
Source: CVE Program / CVE List V5
Vulnerability Description
4gaBoards is a boards system for realtime project management. Prior to 3.3.9, 4gaBoards allows an authenticated user to modify ssoGoogleId, ssoGoogleEmail, ssoGithubId, ssoGithubUsername, ssoGithubEmail, ssoMicrosoftId, ssoMicrosoftEmail, ssoOidcId, and ssoOidcEmail through PATCH /api/users/:id. The whitelist in server/api/controllers/users/update.js mass assigns these backend-managed identity attributes from user input. An attacker can place a victim's provider identifier on an attacker-controlled account, causing the default lookup in helpers such as server/api/helpers/users/get-create-one-for-github-sso.js to match the victim's first SSO login to the attacker's account before the email-linkage flow runs. The victim is logged into the attacker-controlled account, and projects, boards, or data the victim creates remain accessible through the attacker's original local credentials. 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:R/S:U/C:H/I:H/A:L
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 3.3.9之前版本存在安全漏洞，该漏洞源于用户更新接口中未正确限制后端身份属性的批量分配，可能导致经过身份验证的攻击者修改账户的SSO身份标识，使受害者的首次SSO登录匹配到攻击者控制的账户，进而造成账户接管及数据泄露。
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-2026-53958

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7157 chars
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III. Intelligence Information for CVE-2026-53958

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Patches & Fixes for CVE-2026-53958 (1)

Vendor Advisories for CVE-2026-53958 (1)

Exploits & Public PoCs for CVE-2026-53958 (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-2026-53959 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-2026-53958

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