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Back to active CVEs
Critical · CVSS 9.2CVE-2026-105211

ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCodeCVE-2026-105211

Answer in brief

CVE-2026-105211 records a Critical severity (CVSS 9.2) vulnerability in ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode. The current sources do not mark it as known exploited. The current feed maps zitadel/zitadel (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 4, 2026Updated Oct 4, 2026Source checked Oct 4, 2026First seen by HOL Oct 4, 2026Material review Oct 4, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps zitadel/zitadel (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
zitadel/zitadelgeneric>=0 <4.17.14.17.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for zitadel/zitadel.
  2. 2Review the reported fix. Update zitadel/zitadel to 4.17.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 4, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User ServiceSame zitadel/zitadel package
  • ZITADEL before 4.17.3 Account Takeover via External IdP LinkingSame zitadel/zitadel package
  • ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent TokensSame zitadel/zitadel package
  • ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey EnrollmentSame zitadel/zitadel package
  • ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init HandlersSame zitadel/zitadel package
  • ZITADEL before 3.4.14 and 4.16.2 Account Takeover via Passkey EnrollmentSame zitadel/zitadel package

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200
Source
CVE List V5
Source checked
Oct 4, 2026
References
2 linked sources
Open source record