Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Cisco Catalyst SD-WAN Manager

Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user due to improper handling of URI encoding in an HTTP request. Added to CISA KEV on 2026-09-30 (federal deadline 2026-10-03).

First seen: 30 Sept 2026
Last update: 30 Sept 2026, 12:00 UTC
Identifiers: CVE-2026-76504
CVSS: 9.8
Source: CISA KEV
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
Severity: critical, exploited in the wild. Patch status: patched.
Affected: Cisco Catalyst SD-WAN Manager
Ids: CVE-2026-76504

Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user due to improper handling of URI encoding in an HTTP request. Added to CISA KEV on 2026-09-30 (federal deadline 2026-10-03).

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-76504") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2026-76504 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU
https://pwned.coffee/i/cisco-catalyst-sd-wan-manager-hex-encoding-vulnerability-cve-2026-76504

Sources

Totalone very hot coffee