CVE-2026-105206

ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User Service

State: Published
Severity: 5.3 Medium
Published: Oct 4, 2026
Updated: Oct 29, 2026
Reserved: Oct 4, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	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	VulnCheck

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
zitadelzitadel	4.0.0 to before 4.17.3Affected 4.17.3Not affected
zitadelzitadel	3.0.0 through 3.4.15Affected

References

GitHub Security Advisory (GHSA-j344-gqv4-84ff)vendor-advisory
VulnCheck Advisory: ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User Servicethird-party-advisory

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