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CVE-2026-39912— v2board / Xboard Authentication Token Exposure via loginWithMailLink

CVSS 9.1 · Critical EPSS 0.07% · P21
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I. Basic Information for CVE-2026-39912

Vulnerability Information
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Vulnerability Title
v2board / Xboard Authentication Token Exposure via loginWithMailLink
Source: NVD (National Vulnerability Database)
Vulnerability Description
V2Board 1.6.1 through 1.7.4 and Xboard through 0.1.9 expose authentication tokens in HTTP response bodies of the loginWithMailLink endpoint when the login_with_mail_link_enable feature is active. Unauthenticated attackers can POST to the loginWithMailLink endpoint with a known email address to receive the full authentication URL in the response, then exchange the token at the token2Login endpoint to obtain a valid bearer token with complete account access including admin privileges.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过发送数据的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
V2Board 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
V2Board是V2Board开源的一个多用户代理服务管理面板。 V2Board 1.6.1至1.7.4版本和Xboard 0.1.9及之前版本存在安全漏洞，该漏洞源于loginWithMailLink端点的HTTP响应体中暴露身份验证令牌，可能导致未认证攻击者获取完整账户访问权限。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
v2boardv2board 1.6.1 ~ 1.7.4 -
cedar2025Xboard 0 ~ 0.1.9 -

II. Public POCs for CVE-2026-39912

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 10124 chars
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III. Intelligence Information for CVE-2026-39912

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IV. Related Vulnerabilities

Same weakness: CWE-201

V. Comments for CVE-2026-39912

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