---
cve: "CVE-2026-105206"
severity: "MEDIUM"
cvss: 5.3
epss: "0.3%"
vendor: "zitadel"
kev: false
exploited: false
published: "2026-10-04 15:16:31"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-08T19:14:13+02:00"
---

# CVE-2026-105206

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

ZITADEL 3.0.0 through 3.4.15 and 4.x before 4.17.3 contains an incorrect authorization flaw in the User Service API, which verifies user.read against the caller's organization rather than the organization owning the target user. An authenticated member holding org-scoped user.read can query GET /v2/users/{userId}/authentication_methods to learn which authentication method types users in other organizations have registered.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-05 14:14:18
- CNA-CVSS: **5.3** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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:L/VI:N/VA:N/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- 41b11149c6997eddd7e38390912e12ff5f918a73 (Commit)

## Referenzen

- <https://github.com/zitadel/zitadel/security/advisories/GHSA-j344-gqv4-84ff>
- <https://www.vulncheck.com/advisories/zitadel-before-4.17.3-cross-organization-authentication-method-enumeration-via-user-service>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-105206/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_