---
cve: "CVE-2026-23511"
severity: "MEDIUM"
cvss: 5.3
epss: "38%"
vendor: "zitadel"
kev: false
exploited: false
published: "2026-01-15 20:16:05"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T20:47:56+02:00"
---

# CVE-2026-23511

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- afe594c3498d9e4c67039f0b3b18e799dcbdb07b (Commit)
- d08f14c513715676195d5d671b5b65664abd5759 (Commit)

## Referenzen

- <https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r>
- <https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2>
- <https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d>
- <https://github.com/zitadel/zitadel/releases/tag/v3.4.6>
- <https://github.com/zitadel/zitadel/releases/tag/v4.9.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-23511) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_