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CVE-2026-41418— 4ga Boards: User Enumeration via Timing Side-Channel in Authentication Endpoint

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.

4ga Boards是RAR个人开发者的一款实时项目管理看板系统。 4ga Boards 3.3.5之前版本存在安全漏洞，该漏洞源于登录端点存在时序侧信道，可能导致用户枚举。

CVSS 5.3 · Medium EPSS 0.33% · P24
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I. Basic Information for CVE-2026-41418

Vulnerability Information
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Vulnerability Title
4ga Boards: User Enumeration via Timing Side-Channel in Authentication Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
4ga Boards is a boards system for realtime project management. Prior to 3.3.5, 4ga Boards is vulnerable to user enumeration via a timing side-channel in the login endpoint (POST /api/access-tokens). When an invalid username/email is provided, the server responds immediately (~17ms average). When a valid username/email is provided with an incorrect password, the server first performs a bcrypt.compareSync() operation (~74ms average) before responding. This ~4.4× timing difference is trivially detectable even over a network — a single request suffices. This vulnerability is fixed in 3.3.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
4ga Boards 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
4ga Boards是RAR个人开发者的一款实时项目管理看板系统。 4ga Boards 3.3.5之前版本存在安全漏洞，该漏洞源于登录端点存在时序侧信道，可能导致用户枚举。
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 < 3.3.5 -

II. Public POCs for CVE-2026-41418

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III. Intelligence Information for CVE-2026-41418

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Vendor Advisories for CVE-2026-41418 (1)

IV. Related Vulnerabilities

Same product: 4gaBoards
Same vendor: RARgames
Same weakness: CWE-208

V. Comments for CVE-2026-41418

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