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CVE-2026-105209— ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollment

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.

ZITADEL 3.x 在 3.4.15 之前版本，以及 4.x 在 4.17.1 之前版本存在一个不正确的授权漏洞：在发放 Passkey 或无密码模式（passwordless）的注册码时，系统仅检查 HTTP 请求头 中指定的组织，而未验证目标用户所属的实际组织。攻击者若在某一组织中拥有用户写入权限，便可获取同一实例中另一组织下用户的注册码，并注册自己的认证器，从而接管该账户。

CVSS 9.6 · Critical

Affected Version Matrix 4

VendorProduct Version RangeStatus
zitadel zitadel < 4.17.1 affected
4.17.1 unaffected
< 3.4.15 affected
3.4.15 unaffected
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I. Basic Information for CVE-2026-105209

Vulnerability Information
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Vulnerability Title
ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollment
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one organization can obtain an enrollment code for a user in another organization on the same instance and register their own authenticator to take over that account.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zitadel zitadel 0 ~ 4.17.1 -
zitadel zitadel 0 ~ 3.4.15 -

II. Public POCs for CVE-2026-105209

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III. Intelligence Information for CVE-2026-105209

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Vendor Advisories for CVE-2026-105209 (1)

News Coverage for CVE-2026-105209 (1)

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-2026-105215 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-2026-105211 8.1 HIGH ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode
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-862

V. Comments for CVE-2026-105209

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