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Back to active CVEs
High · CVSS 8.8CVE-2026-109371

ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1CVE-2026-109371

Answer in brief

CVE-2026-109371 records a High severity (CVSS 8.8) vulnerability in ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1. 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 12, 2026Updated Oct 12, 2026Source checked Oct 12, 2026First seen by HOL Oct 12, 2026Material review Oct 12, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.8. 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>=3.0.0 <4.18.04.18.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for zitadel/zitadel.
  2. 2Review the reported fix. Update zitadel/zitadel to 4.18.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 12, 2026

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

  2. Source modified

    Oct 12, 2026

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

  3. First seen by HOL

    Oct 12, 2026

Sources and claim methodology

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

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider ConfusionSame zitadel/zitadel package
  • ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Login V2 Session CookieSame zitadel/zitadel package
  • ZITADEL 3.0.0 before 4.19.2 Privilege Escalation via OIDC Token Exchange ImpersonationSame zitadel/zitadel package
  • hex_core decompresses registry and Erlang term API responses without size limitsSame generic ecosystem
  • WordPress Broadcast Live Video plugin <= 7.3.6 - Broken Access Control vulnerabilitySame generic ecosystem
  • WordPress Paid Videochat Turnkey Site plugin <= 7.5.13 - Broken Access Control vulnerabilitySame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-306
Source
CVE List V5
Source checked
Oct 12, 2026
References
2 linked sources
Open source record