---
cve: "CVE-2026-105209"
severity: "CRITICAL"
cvss: 9.3
epss: "0.2%"
vendor: "zitadel"
kev: false
exploited: false
published: "2026-10-04 15:16:32"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-08T20:28:31+02:00"
---

# CVE-2026-105209

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one organization can obtain an enrollment code for a user in another organization on the same instance and register their own authenticator to take over that account.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-05 20:29:16
- CNA-CVSS: **9.3** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- a9311b8c702531832575351a663e98a2242778e5 (Commit)
- d81ab1cf4e35f7119870416aaac4e4204a337fc3 (Commit)

## Referenzen

- <https://github.com/zitadel/zitadel/security/advisories/GHSA-pq2q-2c6r-75c4>
- <https://www.vulncheck.com/advisories/zitadel-before-3.4.15-and-4.17.1-cross-organization-account-takeover-via-passkey-enrollment>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-105209/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_