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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 是一款极简且可定制的打字测试应用。在版本 26.26.0 及更早版本中，后端速率限制密钥生成器（位于 ）在优先使用由 派生的 值之前，会采用客户端可控的 和 HTTP 请求头。 未经身份验证的攻击者可以通过轮换（修改）上述任一请求头，为每个请求创建新的速率限制桶（bucket），从而绕过 、 、 以及公共端点所使用的 fallback 机制。此举允许攻击者反复发起 和 请求，从而对已注册用户实施邮件轰炸，消耗 Firebase 或 SMTP 服务的配额，规避暴力破解保护，并可能导致资源耗尽（D

CVSS 7.5 · High EPSS 0.27% · P19

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

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
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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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