Cisco Fixes Actively Exploited Zero-Day CVE-2026-20045 in Unified CM and Webex
Jan 22, 2026
Vulnerability / Zero-Day
Cisco has released fresh patches to address what it described as a "critical" security vulnerability impacting multiple Unified Communications (CM) products and Webex Calling Dedicated Instance that it has been actively exploited as a zero-day in the wild. The vulnerability, CVE-2026-20045 (CVSS score: 8.2), could permit an unauthenticated remote attacker to execute arbitrary commands on the underlying operating system of a susceptible device. "This vulnerability is due to improper validation of user-supplied input in HTTP requests," Cisco said in an advisory. "An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root." The critical rating for the flaw is due to the fact that its exploitation could allow for privil...
