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CVE-2026-56668— ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange

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 4.15.3之前版本存在授权问题漏洞，该漏洞源于OAuth2令牌交换端点未验证subject token是否属于请求客户端或请求范围是否在原token范围内，可能导致低权限令牌被交换为其他应用程序的高权限。

CVSS 8.1 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1550.001 · Application Access Token

Affected Version Matrix 1

VendorProduct Version RangeStatus
zitadel zitadel < 4.15.3 affected
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I. Basic Information for CVE-2026-56668

Vulnerability Information
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Vulnerability Title
ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client or that requested scopes remain within the original token's scopes, allowing a low-privilege token to be exchanged for elevated permissions at another application. This issue is fixed in version 4.15.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 4.15.3之前版本存在授权问题漏洞，该漏洞源于OAuth2令牌交换端点未验证subject token是否属于请求客户端或请求范围是否在原token范围内，可能导致低权限令牌被交换为其他应用程序的高权限。
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 < 4.15.3 -

II. Public POCs for CVE-2026-56668

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10157 chars
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III. Intelligence Information for CVE-2026-56668

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Patches & Fixes for CVE-2026-56668 (1)

Vendor Advisories for CVE-2026-56668 (1)

Vendor Pages for CVE-2026-56668 (1)

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

CVE-2026-55672 7.4 HIGH ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token f
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-862

V. Comments for CVE-2026-56668

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