Vulnerability · Published Oct 4, 2026 · Assigned by VulnCheck

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

Medium 5.3

In plain English

A medium-severity incorrect authorization in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 79.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
zitadel	zitadel	4.0.0 – before 4.17.3
zitadel	zitadel	3.0.0 – through 3.4.15

Weakness: CWE-863 · Vector: 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

References

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