CVE-2026-20122

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.

• Published Feb 25, 2026
• CVSS 5.4 medium
• 25.0% chance of exploitation in the next 30 days (EPSS)
• In CISA's Known Exploited Vulnerabilities catalog

CVE-2026-20122 at the National Vulnerability Database