What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-07-10
• Weakness: CWE-287

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 products

• zitadel: from 4.0.0-rc.1, < 4.15.2; before 3.4.12

References

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

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