CVE-2026-105207
ZITADEL before 4.17.3 Account Takeover via External IdP Linking
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 4, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 4, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
zitadelzitadel |
|
zitadelzitadel |
|
References
- GitHub Security Advisory (GHSA-g8gj-gq47-xgf4)vendor-advisory
- VulnCheck Advisory: ZITADEL before 4.17.3 Account Takeover via External IdP Linkingthird-party-advisory
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