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CVE-2026-105211— ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode

Quick assessment

Affected
zitadel zitadel
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.

在 ZITADEL 4.17.1 版本之前，Login V2 中存在一个身份验证绕过漏洞，该漏洞允许未经身份验证的攻击者通过利用 传递类型获取一次性密码（OTP）代码，从而接管用户账户。如果攻击者知道受害者的登录名，并且该受害者已启用 OTP-Email 和 OTP-SMS，那么攻击者可以从服务器操作响应中读取 OTP 代码，进而获得经过多因素认证（MFA）的会话权限，甚至实现管理员权限接管。

CVSS 8.1 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
zitadel zitadel < 4.17.1 affected
4.17.1 unaffected
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I. Basic Information for CVE-2026-105211

Vulnerability Information
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Vulnerability Title
ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL before 4.17.1 contains an authentication bypass vulnerability in Login V2 that allows unauthenticated attackers to take over accounts by obtaining OTP codes via the returnCode delivery type. Attackers knowing a login name of a victim with OTP-Email and OTP-SMS enrolled can read both codes from server-action responses to gain MFA-authenticated sessions, including administrator takeover.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zitadel zitadel 0 ~ 4.17.1 -

II. Public POCs for CVE-2026-105211

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III. Intelligence Information for CVE-2026-105211

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Vendor Advisories for CVE-2026-105211 (2)

Same Patch Batch · zitadel · 2026-10-04 · 10 CVEs total

CVE-2026-105207 9.8 CRITICAL ZITADEL before 4.17.3 Account Takeover via External IdP Linking
CVE-2026-105209 9.6 CRITICAL ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollmen
CVE-2026-105215 9.1 CRITICAL ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback
CVE-2026-105210 8.2 HIGH ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers
CVE-2026-105213 8.2 HIGH ZITADEL before 4.17.1 Authentication Bypass via Login V2 for Deactivated Organizations
CVE-2026-105208 7.7 HIGH ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent Tokens
CVE-2026-105212 7.5 HIGH ZITADEL before 3.4.14 and 4.16.2 Account Takeover via Passkey Enrollment
CVE-2026-105206 5.3 MEDIUM ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User Servic
CVE-2026-105214 2.3 LOW Zitadel before 4.16.2 SSRF via Organization Domain HTTP Verification

IV. Related Vulnerabilities

Same product: zitadel
Same vendor: zitadel
Same weakness: CWE-200

V. Comments for CVE-2026-105211

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