Improper authentication in Catalyst SD-WAN Manager (formerly SD-WAN vManage) - CVE-2026-20129
Published: February 25, 2026
Vulnerability identifier: #VU123268
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20129
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in the API user authentication mechanism. A remote non-authenticated attacker can bypass authentication process and access the affected system under netadmin role.
Affected software
Catalyst SD-WAN Manager (formerly SD-WAN vManage)
How to mitigate CVE-2026-20129
Install updates from vendor's website.
Catalyst SD-WAN Manager (formerly SD-WAN vManage) - addressed in versions 20.9.8.2, 20.12.5.3, 20.12.6.1, 20.15.4.2