Track vulnerabilities like this one. Sign up free to get alerted when software you use is affected.
9.3

ZITADEL lets attackers hijack accounts via external login

CVE-2026-105207 · published 14 days ago
Summary

Versions of ZITADEL from 3.0.0 up to 4.17.2 can link a user’s account to an outside identity provider without checking who is making the change. An attacker who knows a user’s login name can attach their own external account and then log in as that user. Update ZITADEL to version 4.17.3 or later, or apply the vendor’s recommended patch, and review account linking settings.

Original advisory text
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 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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.3 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-306Missing Authentication for Critical Function
Timeline
Published4 Oct 2026
Updated15 Oct 2026
First seen4 Oct 2026
Sources
CVE-2026-105207 · NVD
CVE-2026-105207 · OSV
GHSA-g8gj-gq47-xgf4 · GHSA
Track software like this
Free during beta