CVE-2026-109371 — ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1
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 flo…
Published: 2026-10-12 · CVSS: 8.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7