Detections
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Cisco Catalyst SD-WAN Manager API Authentication Bypass Vulnerability (cisco-sa-sdwan-webauth-xr8beuuU)

critical Nessus Plugin ID 362627

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco SD-WAN Viptela Software is affected by a vulnerability.

 - An authentication bypass vulnerability exists in the API session-based authentication management of Cisco Catalyst SD-WAN Manager due to improper handling of URI encoding (hex encoding) in HTTP requests.
 An unauthenticated, remote attacker can exploit this, via a specially crafted HTTP request, to bypass authentication and execute arbitrary actions with admin privileges. (CVE-2026-76504)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCww79570

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCww79570

http://www.nessus.org/u?d81f2a5b

Plugin Details

Severity: Critical

ID: 362627

File Name: cisco-sa-sdwan-webauth-xr8beuuU.nasl

Version: 1.1

Type: Local

Family: CISCO

Published: 10/2/2026

Updated: 10/2/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.4

Percentile: 99.82

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-76504

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/o:cisco:sd-wan_firmware

Required KB Items: Cisco/Viptela/Version

Patch Publication Date: 9/30/2026

Vulnerability Publication Date: 9/30/2026

CISA Known Exploited Vulnerability Due Dates: 9/30/2026

Reference Information

CVE: CVE-2026-76504

CWE: 177

CISCO-SA: cisco-sa-sdwan-webauth-xr8beuuU

IAVA: 2026-A-1061

CISCO-BUG-ID: CSCww79570