CRITICALpublic-safe

CVE-2026-105211

NVD: 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. NVD: 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. OSV: ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode

CVSS
9.2 Severity
CRITICAL EPSS
0.0033 (25) KEV
-

Source-published summary

Possible impact

Affected context

Affected product or version requires source confirmation.

Remediation / advisory

Remediation reference present; patch status requires confirmation in the linked advisory.

Why it matters

Source describes authentication boundary review · remote exposure · authenticated boundary. Possible impact: This critical severity issue needs human triage to confirm exposure, affected versions, and vendor guidance for authentication boundary review · remote exposure · authenticated boundary.; CVSS 9.2 (CRITICAL); EPSS percentile 25; not listed in KEV; Remediation reference present; patch status requires confirmation in the linked advisory; sources: NVD, OSV.

What to verify

Confirm affected product/version, vendor advisory, patch or mitigation, and exposure.

Exposure hint

remote exposure

Impact tags

authentication boundary reviewremote exposure relevantauthenticated boundary review

Urgency reasons

CVSS CRITICALvendor advisory presentrecent updateremediation reference present

Source-derived note

Summary derived from NVD / OSV description; unsafe procedural detail is not shown.

Redaction metadata

source summary used: True
fallback summary used: False
unsafe procedural detail present: false
raw source displayed: false
public summary redacted: true

Remediation handoff

Public-safe static handoff for human/Codex remediation planning. Scan, patch, external execution, and auto remediation are disabled.

Handoff JSON Handoff Markdown Safe Codex prompt

Safety note

This radar shows source-published defensive context only. Exploit procedures, exploit strings, scanner commands, and auto-remediation are not provided.