---
id: CVE-2026-76504
title: "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.\r\n\r\nThis vulnerability is …"
summary: "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.\r\n\r\nThis vulnerability is …"
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-177
vendor: Cisco
product: Cisco Catalyst SD-WAN Manager
affected:
  - catalyst_sd-wan_manager 18.3.6
  - catalyst_sd-wan_manager 18.3.7
  - catalyst_sd-wan_manager 18.3.8
  - catalyst_sd-wan_manager 17.2.10
  - catalyst_sd-wan_manager 18.3.6.1
  - catalyst_sd-wan_manager 18.2.0
  - catalyst_sd-wan_manager 18.4.3
  - catalyst_sd-wan_manager 18.4.1
  - catalyst_sd-wan_manager 17.2.8
  - catalyst_sd-wan_manager 18.3.3.1
  - catalyst_sd-wan_manager 18.4.0
  - catalyst_sd-wan_manager 18.3.1
  - catalyst_sd-wan_manager 17.2.6
  - catalyst_sd-wan_manager 17.2.9
  - catalyst_sd-wan_manager 18.3.4
  - catalyst_sd-wan_manager 17.2.5
  - catalyst_sd-wan_manager 18.3.1.1
  - catalyst_sd-wan_manager 18.3.5
  - catalyst_sd-wan_manager 18.4.0.1
  - catalyst_sd-wan_manager 18.3.3
  - catalyst_sd-wan_manager 17.2.7
  - catalyst_sd-wan_manager 17.2.4
  - catalyst_sd-wan_manager 18.3.0
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T13:17:20.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76504'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU
    label: psirt@cisco.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-30T14:05:17.354Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.