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CVE-2026-109371

8.2, high

zitadel Missing Authentication for Critical Function Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.2, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 28.6% of scored CVEs
Exploitation
No public evidence
Published
12 Oct 20265 days ago

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.

Details

Vendor
Zitadel
Product
zitadel
Weakness
CWE-306 (opens in a new tab)
Status
Deferred
Updated
12 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Zitadel CVEs

Every Zitadel CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-109372 zitadel Improper Authentication Vulnerability EPSS 0.4% 8.7, high
  • CVE-2026-109373 ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to… EPSS 0.4% 8.1, high

Beyond this page

Is CVE-2026-109371 in your network?

This page tells you how dangerous CVE-2026-109371 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.