CVE-2026-55672
ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token flows (RFC 6749 Section 4.1.3 violation)
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 CWE-863 |
| Vendor | zitadel |
| Product | zitadel |
| Published | Jul 10, 2026 |
| Last Updated | Jul 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
zitadel / zitadel
>= 4.0.0-rc.1, < 4.15.2 < 3.4.12
References
github.com: https://github.com/zitadel/zitadel/security/advisories/GHSA-xqxv-4jc2-x56x github.com: https://github.com/zitadel/zitadel/commit/562403079a98cf2059cdac11865a45e2f285be71 github.com: https://github.com/zitadel/zitadel/commit/5b1708e0e650398f0ebc3341714f0798b0118917 github.com: https://github.com/zitadel/zitadel/releases/tag/v3.4.12 github.com: https://github.com/zitadel/zitadel/releases/tag/v4.15.2