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TI-2026-82646 Aliases CVE-2026-119128GHSA-vc67-2j7f-xv7j

Authentication bypass in ZITADEL Login V2 enables account takeover

Priority MEDIUM 41CWE-565Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

ZITADEL 4.0.0 before 4.19.5 contains an authentication bypass in the Login V2 UI that lets unauthenticated attackers take over accounts. The flaw is reliance on cookies without validation and integrity checking (CWE-565), so a verificationCheck cookie can be forged. An unauthenticated remote attacker can use it on users who have no authentication method to set their first credential, such as a password, passkey, or linked identity provider.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

ZITADEL 4.0.0 before 4.19.5 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to set the first credential of users lacking any authentication method. Attackers can compute a valid verificationCheck cookie from the user ID and browser fingerprint to set a password, register a passkey, or link an identity provider, taking over the account.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.19.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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 4.19.54.19.5Patch availableCNA
  • zitadel Vendorzitadel Affected 4.0.0 to before 4.19.5 Fixed in 4.19.5 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

Upgrade ZITADEL to version 4.19.5 or later, which fixes the affected 4.0.0 before 4.19.5 range.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA zitadel (zitadel) Fixed in 4.19.5

Fixed in the same release

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

  • Release ·

    zitadel 4.19.5

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-82647 ZITADEL Login V2 flaw lets attackers approve device authorizationsPriority MEDIUM 45
    • TI-2026-82645 Host header injection in ZITADEL Login V2 enables account takeoverPriority LOW 39
    Show all 3 records →

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-119128
  2. 2026-10-29 Alias added: GHSA-vc67-2j7f-xv7j
  3. 2026-10-31 Priority changed: MEDIUM → LOW
  4. 2026-11-03 CISA SSVC decision points changed
  5. 2026-11-03 Priority changed: LOW → MEDIUM

References

Advisory 1

  • TI-2024-26607 ZITADEL Vulnerable to Session Information Leakage CVSS 3.1MEDIUM 6.5
  • TI-2026-67551 ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback CVSS 4.0CRITICAL 9.3
  • 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
See all 77 →

Sources

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