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

Quick assessment

Affected
zitadel zitadel
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZITADEL是瑞士ZITADEL公司开源的一个身份和访问管理平台。 ZITADEL 3.4.12之前版本和4.15.2之前版本存在授权问题漏洞，该漏洞源于OAuth2和OIDC的CodeExchange、RefreshToken以及设备令牌流未能验证请求客户端是否与发起授权流程的客户端匹配，可能导致被拦截的授权或刷新令牌在不同的客户端下被交换。

CVSS 7.4 · High EPSS 0.43% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
zitadel zitadel >= 4.0.0-rc.1, < 4.15.2 affected
< 3.4.12 affected
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I. Basic Information for CVE-2026-55672

Vulnerability Information
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Vulnerability Title
ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token flows (RFC 6749 Section 4.1.3 violation)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ZITADEL 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZITADEL是瑞士ZITADEL公司开源的一个身份和访问管理平台。 ZITADEL 3.4.12之前版本和4.15.2之前版本存在授权问题漏洞，该漏洞源于OAuth2和OIDC的CodeExchange、RefreshToken以及设备令牌流未能验证请求客户端是否与发起授权流程的客户端匹配，可能导致被拦截的授权或刷新令牌在不同的客户端下被交换。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zitadel zitadel >= 4.0.0-rc.1, < 4.15.2 -

II. Public POCs for CVE-2026-55672

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8741 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-55672

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Patches & Fixes for CVE-2026-55672 (2)

Vendor Advisories for CVE-2026-55672 (1)

Vendor Pages for CVE-2026-55672 (2)

Same Patch Batch · zitadel · 2026-07-10 · 9 CVEs total

CVE-2026-56668 8.1 HIGH ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange
CVE-2026-56667 7.3 HIGH ZITADEL: Stored XSS via Default URI Redirect in Login V2
CVE-2026-56666 4.8 MEDIUM ZITADEL: Auto-linking by email: IdP-side email verification is not checked
CVE-2026-55669 4.2 MEDIUM ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider
CVE-2026-56665 4.2 MEDIUM ZITADEL: Missing Token Expiration (`exp`) Validation in JWT IdP Provider
CVE-2026-56664 4.2 MEDIUM ZITADEL: Missing Token Lifecyle Validation (`exp` and `iat`) in JWT IdP Provider
CVE-2026-55670 ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers
CVE-2026-55671 ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Component

IV. Related Vulnerabilities

Same product: zitadel
Same vendor: zitadel
Same weakness: CWE-287

V. Comments for CVE-2026-55672

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