VULNERABILITY INTELLIGENCE

CVE-2026-76504

CVSS score9.8 CRITICAL
EPSS probability1.82%
CISA KEVKnown exploited vulnerability
Published2026-09-30
Last modified2026-10-03
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Known Exploited Vulnerability

Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Vendor / product: Cisco / Catalyst SD-WAN Manager

Description

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.

Weakness classification

  • CWE-177: Improper Handling of URL Encoding (Hex Encoding)

Primary references