CVE-2026-20262
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.
- Published Jun 15, 2026
- CVSS 6.5 medium
- 28.2% chance of exploitation in the next 30 days (EPSS)
- In CISA's Known Exploited Vulnerabilities catalog
Affected software
In the news
- Cisco Warns of Attackers Exploiting Critical Authentication Bypass in SD-WAN Manager The Hacker News ·
- Cisco warns of new SD-WAN zero-day exploited in attacks BleepingComputer ·