---
cve: "CVE-2026-30851"
severity: "HIGH"
cvss: 8.1
epss: "25%"
vendor: "caddyserver"
kev: false
exploited: false
published: "2026-03-07 17:15:52"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T06:22:23+02:00"
---

# CVE-2026-30851

> 8.1 HIGH · 🧪 PoC

## Beschreibung

Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forward_auth copy_headers does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- ffb6ab0644f24c5ee6542aca6bd59b7a1b0a8f91 (Commit)

## Referenzen

- <https://github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4>
- <https://github.com/caddyserver/caddy/issues/6610>
- <https://github.com/caddyserver/caddy/pull/6608>
- <https://github.com/caddyserver/caddy/pull/7545>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-30851) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_