CVE-2026-105207
Critical · 9.8CVSS
9.8
EPSS
0.3%
Published
Oct 4, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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