---
cve: "CVE-2026-56022"
severity: "MEDIUM"
cvss: 6.9
epss: "0.6%"
vendor: "Webmin"
kev: false
exploited: false
published: "2026-06-18 16:11:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-26T21:43:42+02:00"
---

# CVE-2026-56022

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.640.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- c0c0cc323cda48ee5903502ca2e3dbbec6a9aee9 (Commit)

## Referenzen

- <https://webmin.com/security/#webmin-prior-to-2640>
- <https://github.com/webmin/webmin/releases/tag/2.640>
- <https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json>
- <https://www.cve.org/CVERecord?id=CVE-2026-56022>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56022) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_