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TI-2026-71183 Aliases CVE-2026-109371GHSA-2464-29qv-3mj7

Missing authentication in ZITADEL Login V1 lets attackers rename users

Priority MEDIUM 44CWE-306Published · 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
None · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

ZITADEL from 3.0.0 before 4.18.0 has a missing authentication flaw in the hosted Login V1 UI, tracked as CWE-306. The change-username handler acts on the account tied to a login flow before any factor is verified. An unauthenticated attacker who knows a victim's login name can rename any active human user, including administrators, which locks them out of their account.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where the change-username handler acts on the account bound to a login flow before any factor is verified. Unauthenticated attackers can submit a victim's login name and then post a new username to rename any active human user, including administrators, locking them out.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00363 30th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.18.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
zitadelzitadel3.0.0 to before 4.18.04.18.0Patch availableCNA
  • zitadel Vendorzitadel Affected 3.0.0 to before 4.18.0 Fixed in 4.18.0 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 4.18.0 or later, the fixed version for the 3.0.0 before 4.18.0 range.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA zitadel (zitadel) Fixed in 4.18.0

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109371
  2. 2026-10-12 Alias added: GHSA-2464-29qv-3mj7
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-15 CISA SSVC decision points changed
  5. 2026-10-15 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