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CVE-2026-69183— Monkeytype: Rate-limit and anti-brute-force controls bypassable via spoofed HTTP headers (forgotPasswordEmail/verificationEmail mail bombing and badAuth bypass)

Quick assessment

Affected
monkeytypegame monkeytype
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.

Monkeytype是Monkeytype组织的一款在线打字测试与练习软件。 Monkeytype 26.26.0及之前版本存在安全漏洞，该漏洞源于后端速率限制密钥生成器使用客户端可控的cf-connecting-ip和x-forwarded-for请求头，可能导致未经身份验证的攻击者绕过速率限制，进行邮件轰炸、消耗配额、逃避暴力破解保护及造成资源耗尽。

CVSS 7.5 · High EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
monkeytypegame monkeytype <= 26.26.0 affected
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I. Basic Information for CVE-2026-69183

Vulnerability Information
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Vulnerability Title
Monkeytype: Rate-limit and anti-brute-force controls bypassable via spoofed HTTP headers (forgotPasswordEmail/verificationEmail mail bombing and badAuth bypass)
Source: CVE Program / CVE List V5
Vulnerability Description
Monkeytype is a minimalistic and customizable typing test. In 26.26.0 and earlier, the backend rate-limit key generator in backend/src/middlewares/rate-limit.ts uses client-controlled cf-connecting-ip and x-forwarded-for headers before the trust-proxy-derived req.ip value. An unauthenticated attacker can rotate either header to create a new bucket for each request, bypassing rootRateLimiter, badAuthRateLimiter, getKey(), and the getKeyWithUid() fallback used by public endpoints. This permits repeated POST /users/forgotPasswordEmail and verificationEmail requests, mail bombing registered users, consuming Firebase or SMTP quota, evading brute-force protection, and enabling resource exhaustion. Exploitability of cf-connecting-ip depends on deployment topology, but x-forwarded-for and direct-to-origin paths remain affected when those values are not overwritten by a trusted proxy. No fixed version is available as of this review.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Monkeytype 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Monkeytype是Monkeytype组织的一款在线打字测试与练习软件。 Monkeytype 26.26.0及之前版本存在安全漏洞，该漏洞源于后端速率限制密钥生成器使用客户端可控的cf-connecting-ip和x-forwarded-for请求头，可能导致未经身份验证的攻击者绕过速率限制，进行邮件轰炸、消耗配额、逃避暴力破解保护及造成资源耗尽。
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
monkeytypegame monkeytype <= 26.26.0 -

II. Public POCs for CVE-2026-69183

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8605 chars
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III. Intelligence Information for CVE-2026-69183

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Vendor Advisories for CVE-2026-69183 (1)

IV. Related Vulnerabilities

Same product: monkeytype
Same vendor: monkeytypegame
Same weakness: CWE-290

V. Comments for CVE-2026-69183

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