Paper/Archive/CVE-2026-105211

CVE-2026-105211

zitadel zitadel — ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode

CVSS 9.2 (CNA)9.2 / 10 × 3027.6 Not in CISA KEV+300.0 EPSS percentile 26.5.265 × 205.3 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

zitadel< 4.17.14.17.1CNA

Scores by source

VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

VulnCheck (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6 writeupvulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-login-v2-otp-returncode