Arbitrary file upload in Catalyst SD-WAN Manager (formerly SD-WAN vManage) - CVE-2026-20122
Published: February 25, 2026 / Updated: April 20, 2026
Vulnerability identifier: #VU123272
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:A/U:Green
CVE-ID: CVE-2026-20122
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Cisco Systems, Inc
Affected software:
Catalyst SD-WAN Manager (formerly SD-WAN vManage)
Catalyst SD-WAN Manager (formerly SD-WAN vManage)
Detailed vulnerability description
The vulnerability allows a remote user to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file during file upload on the API interface. A remote authenticated user can upload a malicious file, execute it on the server and gain vmanage user privileges.
How to mitigate CVE-2026-20122
Install updates from vendor's website.