CVE-2026-20059: Cisco Unity Connection

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an unauthenticated, remote attacker to conduct a reflected XSS attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Affected products

• Cisco Unity Connection: up to and including 12.5; version 14.0 only; version 14su1 only; version 14su2 only; version 14su3 only; version 14su3a only; …

Published 2026-04-15. Last modified 2026-06-17.