---
cve: "CVE-2026-63509"
severity: "CRITICAL"
cvss: 9.9
epss: "1%"
vendor: "Microsoft"
kev: false
exploited: false
published: "2026-08-20 22:17:46"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-23T14:23:27+02:00"
---

# CVE-2026-63509

> 9.9 CRITICAL

## Beschreibung

Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

## CNA-Record (Kanon, cvelistV5)

- CNA: **microsoft**
- State: PUBLISHED
- Stand: 2026-10-21 20:55:06
- CNA-CVSS: **9.9** (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-23** — Relative Path Traversal
  The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

## Angriffsmuster (CAPEC)

- [CAPEC-76 — Manipulating Web Input to File System Calls](https://capec.mitre.org/data/definitions/76.html) _(Severity: Very High)_
- [CAPEC-139 — Relative Path Traversal](https://capec.mitre.org/data/definitions/139.html) _(Severity: High)_

## Referenzen

- <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63509>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-63509/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_