CVE-2018-0435: Cisco Umbrella

Critical severity, CVSS 9.1. EPSS: 1.1% chance of exploitation in the next 30 days.

A vulnerability in the Cisco Umbrella API could allow an authenticated, remote attacker to view and modify data across their organization and other organizations. The vulnerability is due to insufficient authentication configurations for the API interface of Cisco Umbrella. An attacker could exploit this vulnerability to view and potentially modify data for their organization or other organizations. A successful exploit could allow the attacker to read or modify data across multiple organizations.

Affected products

• Cisco Umbrella: any version

Published 2018-10-05. Last modified 2026-06-17.