CVE-2026-20262
Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability
- Published
- Jun 15, 2026
- Updated
- Jun 17, 2026
- Assigning CNA
- cisco
- Evidence observed
- Jun 15, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NModerate · next 30 days
- Percentile
- 98.1%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
1Proof-of-concept exploit for CVE-2026-20262 path traversal in Cisco Catalyst SD-WAN Manager, enabling authenticated remote arbitrary file write via unsanitized filename parameter.
Responsible use
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