---
title: "CVE-2026-76504: Cisco Catalyst SD-WAN Manager - Authentication Bypass"
description: "Cisco Catalyst SD-WAN Manager contains an authentication bypass caused by improper URI encoding handling in HTTP requests, letting unauthenticated remote attackers gain admin privileges, exploit requires crafted HTTP request."
url: https://panop.io/threat-heartbeat/CVE-2026-76504/
---

# CVE-2026-76504 Cisco Catalyst SD-WAN Manager - Authentication Bypass

Cisco Catalyst SD-WAN Manager contains an authentication bypass caused by improper URI encoding handling in HTTP requests, letting unauthenticated remote attackers gain admin privileges, exploit requires crafted HTTP request.

CVSS base score 9.8 /10

Critical

CISA KEV

Exploited in the wild

Public exploit

Proof of concept available

Authentication

Not required

EPSS

1.82% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76504)

## Details

Type

Authentication Bypass

Impact

Privilege Escalation

CVSS vector

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

Published

30 September 2026

Updated

15 October 2026

Weakness

[CWE-177](https://cwe.mitre.org/data/definitions/177.html)

## Vendor fix

Update to the latest available version with the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76504](https://nvd.nist.gov/vuln/detail/CVE-2026-76504)
- [https://x.com/DefusedCyber/status/2105596103458492919](https://x.com/DefusedCyber/status/2105596103458492919)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU)
- [https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field\_cve=CVE-2026-76504](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76504)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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