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CVE-2026-55669— ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider

Quick assessment

Affected
zitadel zitadel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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之前版本存在输入验证错误漏洞，该漏洞源于外部JWT Identity Provider验证令牌签名和issuer但未验证aud声明，可能导致来自可信颁发者的有效签名令牌被其他依赖方接受。

CVSS 4.2 · Medium EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

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-2026-55669

Vulnerability Information
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Vulnerability Title
ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider
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 external JWT Identity Provider validates a token's signature and issuer (iss) but not the audience (aud) claim, allowing a validly signed token from a trusted issuer for another relying party to be accepted by ZITADEL. 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:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
ZITADEL 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于外部JWT Identity Provider验证令牌签名和issuer但未验证aud声明，可能导致来自可信颁发者的有效签名令牌被其他依赖方接受。
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-2026-55669

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III. Intelligence Information for CVE-2026-55669

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Vendor Pages for CVE-2026-55669 (2)

Other References for CVE-2026-55669 (1)

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-2026-55672 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-2026-56665 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-346