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.
Advisories
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Mon, 12 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1 | |
| First Time appeared |
Zitadel
Zitadel zitadel |
|
| Weaknesses | CWE-306 | |
| CPEs | cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Zitadel
Zitadel zitadel |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-12T16:05:44.304Z
Reserved: 2026-10-12T14:23:25.691Z
Link: CVE-2026-109371
No data.
Status : Deferred
Published: 2026-10-12T17:17:34.547
Modified: 2026-10-12T17:17:34.700
Link: CVE-2026-109371
No data.
OpenCVE Enrichment
No data.
Weaknesses