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CVE-2026-105206— ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User Service

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 以及 4.x 系列中早于 4.17.3 的版本在用户服务 API 中存在一个不正确的授权漏洞。该漏洞在验证 权限时，错误地基于调用者所属的组织（organization）进行校验，而非目标用户所属的组织。 因此，即使认证成员仅持有针对其所在组织的 权限，仍可通过调用 接口，查询到其他组织中用户已注册的认证方法类型。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

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-2026-105206

Vulnerability Information
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Vulnerability Title
ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User Service
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL 3.0.0 through 3.4.15 and 4.x before 4.17.3 contains an incorrect authorization flaw in the User Service API, which verifies user.read against the caller's organization rather than the organization owning the target user. An authenticated member holding org-scoped user.read can query GET /v2/users/{userId}/authentication_methods to learn which authentication method types users in other organizations have registered.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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-2026-105206

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III. Intelligence Information for CVE-2026-105206

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Vendor Advisories for CVE-2026-105206 (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-2026-105211 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-2026-105214 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-863

V. Comments for CVE-2026-105206

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