high8.2
CVE-2026-109371
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 bo…
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| ZITADEL 3.0.0 | before 4.18.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.