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CVE-2026-105207— ZITADEL before 4.17.3 Account Takeover via External IdP Linking

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 3.0.0 至 3.4.15 版本以及 4.0.0 至 4.17.3 之前版本在用户账号与外部身份提供商（External Identity Providers）之间建立关联时，未验证主认证因子（primary factor）或调用者的权限，即使在仅标识的登录 V2（identify-only Login V2）会话中，以及通过用户服务 V2 的 AddIDPLink 端点也是如此。未认证的攻击者若知晓受害者的登录名，便可将自身的外部身份提供商身份绑定到受害者账号上，随后即可冒充该受害者登录系统。

CVSS 9.8 · Critical

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 3

VendorProduct Version RangeStatus
zitadel zitadel < 4.17.3 affected
4.17.3 unaffected
≤ 4.19.4 affected
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I. Basic Information for CVE-2026-105207

Vulnerability Information
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Vulnerability Title
ZITADEL before 4.17.3 Account Takeover via External IdP Linking
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated attacker knowing a victim's login name can bind their own external IdP identity to the victim's account and then sign in as the victim.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zitadel zitadel 0 ~ 4.17.3 -
zitadel zitadel 0 ~ 4.19.4 -

II. Public POCs for CVE-2026-105207

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III. Intelligence Information for CVE-2026-105207

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Vendor Advisories for CVE-2026-105207 (2)

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

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-2026-105211 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-306

V. Comments for CVE-2026-105207

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