CVE-2026-105207 — ZITADEL before 4.17.3 Account Takeover via External IdP Linking
ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permi…
Published: 2026-10-04 · CVSS: 9.3 · CVSS 4.0
ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated attacker knowing a victim's login name can bind their own external IdP identity to the victim's account and then sign in as the victim.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7