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CVE-2026-23511— ZITADEL has a user enumeration vulnerability in Login UIs

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开源的一个 Auth0、Firebase Auth、AWS Cognito 以及为容器和无服务器时代构建的 Keycloak 的现代开源替代方案。 ZITADEL 4.9.1之前版本和3.4.6之前版本存在安全漏洞，该漏洞源于登录接口存在用户枚举漏洞，可能导致确认有效用户账户。

CVSS 5.3 · Medium EPSS 0.40% · P34
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I. Basic Information for CVE-2026-23511

Vulnerability Information
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Vulnerability Title
ZITADEL has a user enumeration vulnerability in Login UIs
Source: CVE Program / CVE List V5
Vulnerability Description
ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
ZITADEL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZITADEL是瑞士ZITADEL开源的一个 Auth0、Firebase Auth、AWS Cognito 以及为容器和无服务器时代构建的 Keycloak 的现代开源替代方案。 ZITADEL 4.9.1之前版本和3.4.6之前版本存在安全漏洞，该漏洞源于登录接口存在用户枚举漏洞，可能导致确认有效用户账户。
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, < 4.9.1 -

II. Public POCs for CVE-2026-23511

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III. Intelligence Information for CVE-2026-23511

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Patches & Fixes for CVE-2026-23511 (1)

IV. Related Vulnerabilities

Same product: zitadel
Same vendor: zitadel
Same weakness: CWE-204