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CVE-2026-111639— bbs-go through 4.4.6 Account Takeover via Google One Tap Login

Quick assessment

Affected
mlogclub bbs-go
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.

bbs-go 4.4.6 及以下版本在 接口中存在身份验证绕过漏洞。该漏洞允许远程攻击者通过提交颁发给任意 OAuth 客户端的 Google ID 令牌，以其他用户的身份登录。攻击者若拥有自己的 Google OAuth 客户端，可捕获受害者签名的 Google ID 令牌并进行重放；由于系统从未验证令牌中的 （受众）声明，攻击者借此即可获取以受害者关联的 Google 账户身份建立的已认证会话。

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
mlogclub bbs-go ≤ 4.4.6 affected
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I. Basic Information for CVE-2026-111639

Vulnerability Information
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Vulnerability Title
bbs-go through 4.4.6 Account Takeover via Google One Tap Login
Source: CVE Program / CVE List V5
Vulnerability Description
bbs-go through 4.4.6 contains an authentication bypass vulnerability in the /api/login/google_one_tap endpoint that allows remote attackers to log in as other users by submitting Google ID tokens issued to any OAuth client. Attackers operating their own Google OAuth client can capture a victim's Google-signed ID token and replay it, since the aud claim is never checked, to obtain an authenticated session as the victim's Google-linked account.
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mlogclub bbs-go 0 ~ 4.4.6 -

II. Public POCs for CVE-2026-111639

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III. Intelligence Information for CVE-2026-111639

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Patches & Fixes for CVE-2026-111639 (1)

Vendor Advisories for CVE-2026-111639 (1)

Proof of Concept for CVE-2026-111639 (1)

Security Blog Posts for CVE-2026-111639 (1)

IV. Related Vulnerabilities

Same product: bbs-go
Same vendor: mlogclub
Same weakness: CWE-287

V. Comments for CVE-2026-111639

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