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CVE-2026-55670— ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers

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 4.15.2之前版本存在安全漏洞，该漏洞源于事件存储验证问题，可能导致已删除用户标识符的原始资源所有者被保留，从而使用相同标识符在另一组织中重新创建的用户被配置到原始组织并暴露给该组织的管理员。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.36% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
zitadel zitadel < 4.15.2 affected
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I. Basic Information for CVE-2026-55670

Vulnerability Information
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Vulnerability Title
ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL is an open source identity management platform. Prior to 4.15.1, ZITADEL's event store validation can retain the original resource owner for a deleted user identifier, causing a later user recreated with the same identifier in another organization to be provisioned under the original organization and exposed to that organization's administrator. This issue is fixed in version 4.15.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ZITADEL 权限许可和访问控制问题漏洞
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 4.15.2之前版本存在安全漏洞，该漏洞源于事件存储验证问题，可能导致已删除用户标识符的原始资源所有者被保留，从而使用相同标识符在另一组织中重新创建的用户被配置到原始组织并暴露给该组织的管理员。
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 < 4.15.2 -

II. Public POCs for CVE-2026-55670

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III. Intelligence Information for CVE-2026-55670

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Patches & Fixes for CVE-2026-55670 (2)

Vendor Advisories for CVE-2026-55670 (1)

Vendor Pages for CVE-2026-55670 (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-2026-55669 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-2026-55671 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-284

V. Comments for CVE-2026-55670

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