{"apiVersion":"1.0","identifier":"CVE-2026-69183","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.","publishedAt":"2026-08-20T17:19:34","lastModifiedAt":"2026-08-20T17:19:34","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-69183","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00274,"riskScore":0.77,"affectedProduct":"Monkeytype","affectedVersions":"<=26.26.0","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-69183","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-69183","en":"https://www.redsauce.net/en/cves/CVE-2026-69183","fr":"https://www.redsauce.net/fr/cves/CVE-2026-69183","pt":"https://www.redsauce.net/pt/cves/CVE-2026-69183","de":"https://www.redsauce.net/de/cves/CVE-2026-69183","sk":"https://www.redsauce.net/sk/cves/CVE-2026-69183","el":"https://www.redsauce.net/el/cves/CVE-2026-69183"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-69183"}}