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CVE-2026-20209: Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-14 · updated 2026-10-26
• Weakness: CWE-779

Description

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker with read-only permissions to elevate their privileges from low to high and perform actions as a high-privileged user. This vulnerability exists because sensitive session information is recorded in audit logs. An attacker could exploit this vulnerability by elevating their read-only permissions in Cisco Catalyst SD-WAN Manager to those of a high-privileged user. A successful exploit could allow the attacker to perform actions as a high-privileged user.

Affected products

• Cisco Catalyst SD-WAN Manager: before 20.9.9.1; from 20.10 before 20.12.5.4; from 20.12.6 before 20.12.6.2; from 20.13 before 20.15.4.4; from 20.15.5 before 20.15.5.2; from 20.16 before 20.18.2.2 — fixed in 20.9.9.1, 20.12.5.4, 20.12.6.2, 20.15.4.4, 20.15.5.2, 20.18.2.2

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.9.9.1, 20.12.5.4, 20.12.6.2, 20.15.4.4. Check the vendor advisory for mitigations.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-mltvnps2-JxpWm7R
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk

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