---
cve: "CVE-2026-65600"
severity: "HIGH"
cvss: 7.8
epss: "41%"
vendor: "traefik"
kev: false
exploited: false
published: "2026-07-22 12:18:20"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T09:38:39+02:00"
---

# CVE-2026-65600

> 7.8 HIGH · 🧪 PoC

## Beschreibung

Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 00d92a043fdee9c562f4b1fda9c2d6f359a25eb2 (Commit)
- 84d4e8b139d1ac5e5b2d250fff95baed5ba0584f (Commit)

## Referenzen

- <https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv>
- <https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-65600) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_