CVE-2025-31124— Zitadel allows User Enumeration by loginname attribute normalization
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存在安全漏洞，该漏洞源于用户名规范化导致用户存在信息泄露。
Possible ATT&CK Techniques 1 AI
T1087.001 · Local Account
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I. Basic Information for CVE-2025-31124
Vulnerability Information
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Vulnerability Title
Zitadel allows User Enumeration by loginname attribute normalization
Source: CVE Program / CVE List V5
Vulnerability Description
Zitadel is open-source identity infrastructure software. ZITADEL administrators can enable a setting called "Ignoring unknown usernames" which helps mitigate attacks that try to guess/enumerate usernames. If enabled, ZITADEL will show the password prompt even if the user doesn't exist and report "Username or Password invalid". While the setting was correctly respected during the login flow, the user's username was normalized leading to a disclosure of the user's existence. This vulnerability is fixed in 2.71.6, 2.70.8, 2.69.9, 2.68.9, 2.67.13, 2.66.16, 2.65.7, 2.64.6, and 2.63.9.
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
通过差异性导致的信息暴露
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存在安全漏洞，该漏洞源于用户名规范化导致用户存在信息泄露。
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
II. Public POCs for CVE-2025-31124
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IV. Related Vulnerabilities
Same product: zitadel
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CVE-2026-109374
ZITADEL 3.0.0 before 4.19.2 Privilege Escalation via OIDC To -
CVE-2026-109373
ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Lo -
CVE-2026-109372
ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identi -
CVE-2026-109371
ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change -
CVE-2026-105214
Zitadel before 4.16.2 SSRF via Organization Domain HTTP Veri
Same vendor: zitadel
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CVE-2026-109374
ZITADEL 3.0.0 before 4.19.2 Privilege Escalation via OIDC To -
CVE-2026-109373
ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Lo -
CVE-2026-109372
ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identi -
CVE-2026-109371
ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change -
CVE-2026-105214
Zitadel before 4.16.2 SSRF via Organization Domain HTTP Veri
Same weakness: CWE-203
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Information Disclosure through REST API Authentication in Sp -
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Snipe-IT before 8.7.0 SSRF Port Scanning via Webhook Testing -
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CVE-2026-111933
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V. Comments for CVE-2025-31124
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