Description
ZITADEL before 4.17.1 contains an authentication bypass vulnerability in Login V2 that allows unauthenticated attackers to take over accounts by obtaining OTP codes via the returnCode delivery type. Attackers knowing a login name of a victim with OTP-Email and OTP-SMS enrolled can read both codes from server-action responses to gain MFA-authenticated sessions, including administrator takeover.
Published: 2026-10-04
Score: 9.2 Critical
EPSS: < 1% Very Low
KEV: No
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Mon, 05 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sun, 04 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Description ZITADEL before 4.17.1 contains an authentication bypass vulnerability in Login V2 that allows unauthenticated attackers to take over accounts by obtaining OTP codes via the returnCode delivery type. Attackers knowing a login name of a victim with OTP-Email and OTP-SMS enrolled can read both codes from server-action responses to gain MFA-authenticated sessions, including administrator takeover.
Title ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode
First Time appeared Zitadel
Zitadel zitadel
Weaknesses CWE-200
CPEs cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*
Vendors & Products Zitadel
Zitadel zitadel
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-05T14:06:56.950Z

Reserved: 2026-10-04T13:02:21.188Z

Link: CVE-2026-105211

cve-icon Vulnrichment

Updated: 2026-10-05T14:06:52.788Z

cve-icon NVD

Status : Deferred

Published: 2026-10-04T15:16:32.333

Modified: 2026-10-05T15:17:19.077

Link: CVE-2026-105211

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-04T17:45:13Z

Weaknesses
  • CWE-200

    Exposure of Sensitive Information to an Unauthorized Actor