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.
Metrics
Affected Vendors & Products
References
History
Mon, 05 Oct 2026 15:30:00 +0000
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ssvc
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Sun, 04 Oct 2026 14:30:00 +0000
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| 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 |
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| Weaknesses | CWE-200 | |
| CPEs | cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Zitadel
Zitadel zitadel |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-04T13:10:04.626Z
Updated: 2026-10-05T14:06:56.950Z
Reserved: 2026-10-04T13:02:21.188Z
Link: CVE-2026-105211
Updated: 2026-10-05T14:06:52.788Z
Status : Deferred
Published: 2026-10-04T15:16:32.333
Modified: 2026-10-05T15:17:19.077
Link: CVE-2026-105211
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