Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

CVE-2026-55672ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token flows (RFC 6749 Section 4.1.3 violation)

High 7.4

In plain English

A high-severity improper authentication in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.4%top 62.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/zitadel/zitadel	1.80.0-v2.20.0.20260616131956-0973b074b488	GHSA-xqxv-4jc2-x56x
Go	github.com/zitadel/zitadel	1.80.0-v2.20.0.20260616131956-0973b074b488	GO-2026-5768

Affected products (as reported)

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

Weakness: CWE-287, CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/zitadel/zitadel/security/advisories/GHSA-xqxv-4jc2-x56x x_refsource_CONFIRM
https://github.com/zitadel/zitadel/commit/562403079a98cf2059cdac11865a45e2f285be71 x_refsource_MISC
https://github.com/zitadel/zitadel/commit/5b1708e0e650398f0ebc3341714f0798b0118917 x_refsource_MISC
https://github.com/zitadel/zitadel/releases/tag/v3.4.12 x_refsource_MISC
https://github.com/zitadel/zitadel/releases/tag/v4.15.2 x_refsource_MISC