---
title: "CVE-2026-76504: Cisco Catalyst SD-WAN Manager System… | CubePath"
description: "A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker…"
language: en
source: https://cubepath.com/security/cve/CVE-2026-76504
---

# CVE-2026-76504: Cisco Catalyst SD-WAN Manager System… | CubePath

## 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.

Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-76504)

## Key data

### CVSS 3.1 Critical 9.8

Score published by cisco in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

| Metric                 | Value     | What it means                                                                       |
| ---------------------- | --------- | ----------------------------------------------------------------------------------- |
| Attack vector          | Network   | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.               |
| Privileges required    | None      | No account or privileges are needed.                                                |
| User interaction       | None      | No action from any user is needed.                                                  |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                   |
| Confidentiality impact | High      | Serious or total effect on the secrecy of data.                                     |
| Integrity impact       | High      | Serious or total effect on the trustworthiness of data.                             |
| Availability impact    | High      | Serious or total effect on availability.                                            |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.38928 (38.9% probability)

Percentile

98.6%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Added to the catalog

Sep 30, 2026

Federal due date

Oct 3, 2026

### CISA assessment as of Sep 30, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

yes

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-177](https://cwe.mitre.org/data/definitions/177.html) Improper Handling of URL Encoding (Hex Encoding)

## Affected products

Products listed in the CVE record, as the CNA published them.

- Cisco Catalyst SD-WAN Manager

  - affected: 20.1.12
  - affected: 19.2.1
  - affected: 18.4.4
  - affected: 18.4.5
  - affected: 20.1.1.1
  - affected: 20.1.1
  - affected: 19.3.0
  - affected: 19.2.2
  - affected: 19.2.099
  - affected: 18.3.6
  - affected: 18.3.7
  - affected: 19.2.0
  - affected: 18.3.8
  - affected: 19.0.0
  - affected: 19.1.0
  - affected: 18.4.302
  - affected: 18.4.303
  - affected: 19.2.097
  - affected: 19.2.098
  - affected: 17.2.10
  - affected: 18.3.6.1
  - affected: 19.0.1a
  - affected: 18.2.0
  - affected: 18.4.3
  - affected: 18.4.1
  - and 390 more

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [cisco-sa-sdwan-webauth-xr8beuuU](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU)  (sec.cloudapps.cisco.com)

## Timeline

1. ID reserved Aug 19, 2026
2. Added to CISA KEV Sep 30, 2026
3. Record published Sep 30, 2026
4. Record last updated Oct 2, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:52 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)