CVE-2026-55672 PUBLISHED

ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token flows (RFC 6749 Section 4.1.3 violation)

Assigner: GitHub_M
Reserved: 17.06.2026 Published: 10.07.2026 Updated: 10.07.2026

ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's OAuth2 and OIDC CodeExchange, RefreshToken, and device token flows fail to verify that the requesting client matches the client that initiated the authorization flow, allowing intercepted grants or refresh tokens to be exchanged under a different client. This issue is fixed in versions 3.4.12 and 4.15.2.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 7.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	zitadel
Product	zitadel
Versions	Version >= 4.0.0-rc.1, < 4.15.2 is affected Version < 3.4.12 is affected

References

Problem Types

CWE-287: Improper Authentication CWE
CWE-863: Incorrect Authorization CWE