CVE-2026-20262
Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability
Description
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.
Weakness: CWE-22
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Manager | Network & Security Management | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Catalyst SD-WAN Manager
Vendor advisory
Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability
Cisco’s rating: Medium (advisory CVSS 6.5) · Published Jun 15, 2026
Bug ID: CSCwu18441
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from