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

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Summary

CVECVE-2026-55672
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 18:16:23 UTC
Updated2026-07-10 19:17:25 UTC
DescriptionZITADEL 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

EPSS: 0.002760000 probability, percentile 0.194600000 (date 2026-07-13)

Problem Types: CWE-287 | CWE-863 | CWE-287 CWE-287: Improper Authentication | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zitadel Zitadel affected >= 4.0.0-rc.1, < 4.15.2 Not specified
CNA Zitadel Zitadel affected < 3.4.12 Not specified

References

ReferenceSourceLinkTags
github.com/zitadel/zitadel/commit/562403079a98cf2059cdac11865a45e2f285be71 [email protected] github.com
github.com/zitadel/zitadel/commit/5b1708e0e650398f0ebc3341714f0798b0118917 [email protected] github.com
github.com/zitadel/zitadel/releases/tag/v3.4.12 [email protected] github.com
github.com/zitadel/zitadel/releases/tag/v4.15.2 [email protected] github.com
github.com/zitadel/zitadel/security/advisories/GHSA-xqxv-4jc2-x56x [email protected] github.com
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