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TI-2026-67551 Aliases CVE-2026-105215GHSA-639g-x9rp-hw3x

ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback

Priority MEDIUM 48CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-290.

Summary

ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00339 27th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.16.2, 3.4.14

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
zitadelzitadel4.0.0 to before 4.16.24.16.2Patch availableCNA
zitadelzitadelbefore 3.4.143.4.14Patch availableCNA
  • zitadel Vendorzitadel Affected 4.0.0 to before 4.16.2 Fixed in 4.16.2 Patch available CNA
  • zitadel Vendorzitadel Affected before 3.4.14 Fixed in 3.4.14 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*——zitadel
  • cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* Versions — — ·zitadel

Remediation

  • Fix · CNA zitadel (zitadel) Fixed in 4.16.2
  • Fix · CNA zitadel (zitadel) Fixed in 3.4.14

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    zitadel 4.16.2

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-67548 ZITADEL before 3.4.14 and 4.16.2 Account Takeover via Passkey EnrollmentPriority LOW 38
    • TI-2026-67550 Zitadel before 4.16.2 SSRF via Organization Domain HTTP VerificationPriority LOW 11
    Show all 3 records →
  • Release ·

    zitadel 3.4.14

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-67548 ZITADEL before 3.4.14 and 4.16.2 Account Takeover via Passkey EnrollmentPriority LOW 38
    Show all 2 records →

Timeline

  1. 2026-10-04 Threatist record created from CVE-2026-105215
  2. 2026-10-04 Alias added: GHSA-639g-x9rp-hw3x
  3. 2026-10-05 CISA SSVC decision points changed
  4. 2026-10-29 Affected versions changed · CNA

References

Advisory 1

  • TI-2024-26607 ZITADEL Vulnerable to Session Information Leakage CVSS 3.1MEDIUM 6.5
  • TI-2026-67543 ZITADEL before 4.17.3 Account Takeover via External IdP Linking CVSS 4.0CRITICAL 9.3
  • TI-2025-41253 ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login CVSS 3.1CRITICAL 9.3
  • TI-2025-39554 Zitadel Bypass Second Authentication Factor CVSS 4.0HIGH 8.7
  • TI-2026-82647 ZITADEL Login V2 flaw lets attackers approve device authorizations CVSS 4.0HIGH 8.6
  • TI-2026-71183 Missing authentication in ZITADEL Login V1 lets attackers rename users CVSS 4.0HIGH 8.8
See all 77 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences