CVE-2026-20262: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability

Medium severity, CVSS 6.5. Actively exploited: in CISA KEV since 2026-06-15. EPSS: 28.2% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Catalyst SD-WAN Manager: before 20.9.9.2 (fixed in 20.9.9.2); from 20.10, before 20.12.7.2 (fixed in 20.12.7.2); from 20.13, before 20.15.4.5 (fixed in 20.15.4.5); from 20.15.5, before 20.15.5.3 (fixed in 20.15.5.3); from 20.16, before 20.18.3.1 (fixed in 20.18.3.1); from 26.1, before 26.1.1.2 (fixed in 26.1.1.2)

Published 2026-06-15. Last modified 2026-07-24.