CVE-2026-76504

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

30/09/2026

Last modified:

03/10/2026

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.<br /> <br /> 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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

9.80

Severity 3.x

CRITICAL

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::		20.9.10.1 (excluding)
cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::	20.12 (including)	20.12.8.2 (excluding)
cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::	20.15 (including)	20.15.6.1 (excluding)
cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::	20.18 (including)	20.18.4.1 (excluding)
cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::	26.1 (including)	26.1.2.1 (excluding)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:26.2:::::::*

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-76504

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools