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      <title>CVE-2026-105210 — ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-105210</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; zitadel&lt;/p&gt;
&lt;p&gt;ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim&amp;#39;s login name can enroll attacker-controlled TOTP, OTP-SMS, OTP-Email, or U2F factors, overwrite the verified phone number, and enumerate users through discrepant errors.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; zitadel&lt;/p&gt;
&lt;p&gt;ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim&amp;#39;s login name can enroll attacker-controlled TOTP, OTP-SMS, OTP-Email, or U2F factors, overwrite the verified phone number, and enumerate users through discrepant errors.&lt;/p&gt;</content:encoded>
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