CVE-2026-76504 KEV
9.8
CRITICAL · CVSS 3.1
Patch first
On CISA KEV — known exploited in the wild, due 2026-10-03.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | — |
| Weakness | CWE-177 |
| On CISA KEV | yes — remediate by 2026-10-03 |
| Public exploit | none known |
| Published | 2026-09-30 |
| Last modified | 2026-09-30 |
CISA KEV
| Name | Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability |
|---|---|
| Added | 2026-09-30 |
| Due | 2026-10-03 |
| Vendor / product | Cisco / Catalyst SD-WAN Manager |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| cisco | catalyst sd-wan manager |
References
→ the Explorer · watch your stack · NVD