CVE-2026-20122
Description
A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system.
This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.
Summary dbcve.org
This is an authenticated file write vulnerability in Cisco Catalyst SD-WAN Manager's API. An attacker with valid read-only credentials can exploit improper file handling in the API interface to upload and overwrite arbitrary files on the local filesystem, potentially achieving privilege escalation to vmanage user privileges.
Mitigation
Apply Cisco's available patch for this vulnerability. Until then, restrict API access to only trusted users, enforce strict least-privilege for API credentials, and monitor for suspicious file upload activities.