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CVE-2026-105206GHSA-j344-gqv4-84ff

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

zitadel zitadel
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.17.3Fixed versionCVE List
Published4 Oct 2026Updated 5 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 3

  • zitadelaffected: all versions before 4.17.3CVE List
  • zitadelunaffected: 4.17.3CVE List
  • zitadelaffected: all versions through 4.19.4CVE List

References 2