What is CVE-2026-20262?
A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system. This vulnerability exists because the affected software does not properly validate user-supplied input during a file upload process. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected API endpoint of the affected system. A successful exploit could allow the attacker to create or overwrite any file on the underlying operating system. This file could later be used to elevate to root. To exploit this vulnerability, the attacker must have valid credentials with at least a lower-privileged, single-task user account.
CISA Known Exploited Vulnerability
Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability
Affected product
Cisco Catalyst SD-WAN Manager
Remediation Steps
- Apply the vendor security update from Cisco for Catalyst SD-WAN Manager
- Review access logs for evidence of root privilege escalation attempts
- Restrict administrative access to SD-WAN Manager to trusted networks only