CVE-2026-62862
Typebot is an open-source chatbot builder. In self-hosted versions up to and including 3.17.1, the default passwordless email magic-link authentication is vulnerable to login-code brute forcing that leads to account takeover. The email provider overrides NextAuth's default cryptographically secure token with a 6-digit code generated using Math.random(), reducing the keyspace to 900,000 with a 10-minute expiry, and the code itself is the raw value placed in the magic link. The verification callback enforces no attempt limit, lockout, or CSRF protection, and an incorrect guess does not consume the real code because the adapter returns null on a not-found token, so a valid code survives unlimited guessing within its lifetime. The only rate limiter applies to the code-sending path and is keyed on the client-controlled X-Forwarded-For header, allowing an attacker to request many concurrent live codes for one victim and further raise the odds of a matching guess. As a result, an anonymous attacker who knows a victim's email address can brute-force the callback and obtain an authenticated session as that user with no victim interaction, gaining full access to the victim's bots, results, and connected integration credentials. Deployments configured for OAuth or SSO only, with no email provider, are not affected. This issue is fixed in version 3.18.0
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9.1
- CVSS vector
- CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- EPSS probability
- 0.51%
- CWE
- CWE-307, CWE-330
- Published
- 2026-08-25
- Last modified
- 2026-08-26
Affected products
- baptisteArno typebot.io
Weakness type
Related vulnerabilities
- CVE-2026-88770 — Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-force-locked accounts
- CVE-2026-78490 — Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to...
- CVE-2026-86729 — WWBN AVideo Unrestricted Authentication Attempts via get_api_preauthorize
- CVE-2026-6223 — OTP Bypass in Bahçelievler Muncipality's BiHayat App
- CVE-2026-20514 — In Audio HAL, there is a possible information disclosure due to a missing permission check. This...
- CVE-2026-20512 — In Audio HAL, there is a possible escalation of privilege due to improper input validation. This...
- CVE-2026-86186 — AVideo API Rate Limit Bypass via Bot User-Agent Header
- CVE-2026-85237 — Missing Rate Limiting in Email OTP Verification Allows Brute-Force Authentication Bypass