Critical CVE-2026-76504 Affects Cisco Catalyst SD-WAN Manager

## Overview CVE-2026-76504 affects Cisco Catalyst SD-WAN Manager. This critical vulnerability has a CVSS score of 9.8. It allows unauthenticated remote attackers to gain admin-level access to the system. ## Technical Details The vulnerability stems from improper handling of URI encoding in HTTP requests. This flaw enables attackers to bypass authentication rules meant to restrict access to specific API endpoints. By crafting a malicious HTTP request, an attacker can exploit this vulnerability to gain unauthorized access to the API as an admin user. ## Impact Successful exploitation of this vulnerability can lead to full administrative control of the affected system. Attackers could manipulate configurations, access sensitive data, and potentially disrupt services. The risk is significant, especially in environments where the Cisco Catalyst SD-WAN Manager is critical for network operations. ## Mitigation Defenders should prioritize patching affected systems as soon as possible. Cisco has released updates to address this vulnerability. Organizations should review their security policies and ensure that all instances of Cisco Catalyst SD-WAN Manager are updated to the latest version. Additionally, monitoring network traffic for unusual activity can help detect potential exploitation attempts.