---
cve: "CVE-2026-76504"
severity: "CRITICAL"
cvss: 9.8
epss: ""
vendor: "Cisco"
kev: true
exploited: true
published: "2026-09-30 13:04:32"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T01:02:06+02:00"
---

# CVE-2026-76504

> 9.8 CRITICAL · ⚠️ CISA KEV (2 Tage) · 🔓 Exploited

## Beschreibung

A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user.

This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.

## CNA-Record (Kanon, cvelistV5)

- CNA: **cisco**
- State: PUBLISHED
- Stand: 2026-09-30 19:58:23
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA KEV seit: **30.09.2026**
- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **active**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

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

| 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 | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## BSI-Hinweise (deutsch)

- [Cisco Catalyst SD-WAN Manager: Schwachstelle ermöglicht Erlangen von Administratorrechten](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3681) — _BSI-Einstufung: kritisch_
  Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco Catalyst SD-WAN Manager ausnutzen, um die Authentifizierung zu umgehen und Administratorrechte zu erlangen.

## Referenzen

- <https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76504) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_