High severity · published Jul 10, 2026
CVE-2026-55672
ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token flows (RFC 6749 Section 4.1.3 violation)
7.4
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZI
zitadel · zitadel
>= 4.0.0-rc.1, < 4.15.2; < 3.4.12 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55672
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55672
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
github.com
https://github.com/zitadel/zitadel/security/advisories/GHSA-xqxv-4jc2-x56x
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