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Critical Cisco Catalyst SD-WAN Manager API authentication bypass exploited in the wild (CVE-2026-76504)

OverviewOn September 30, 2026, Cisco published a security advisory for CVE-2026-76504, a critical API authentication bypass vulnerability affecting Cisco Catalyst SD-WAN Manager. The vulnerability has a CVSSv3.1 score of 9.8 and results from improper handling of URL encoding (CWE-177). An unauthenticated, remote attacker can send a crafted HTTP request that bypasses an authentication rule for a specific API endpoint, gaining access to the API with the privileges of the admin user.According to…

KEV ✓ EPSS 0.92 CVSS 9.8 CVE-2026-20127 CVE-2026-20182 CVE-2026-76504 Cisco US

tg: zneužíváno tg: zranitelnost tp: identita

30. 9. 2026 17:09 · Rapid7 · Critical Cisco Catalyst SD-WAN Manager API authentication bypass exploited in the wild (CVE-2026-76504)

SPOJENO PŘES CVE Cisco Catalyst SD-WAN Controller, Catalyst SD-WAN Manager, and Catalyst SD-WAN Validator Authenticated Privilege Escalation Vulnerability

A vulnerability in the CLI of Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by uploading a crafted file to the…

KEV ✓ EPSS 0.92 CVE-2026-20127 CVE-2026-20182 CVE-2026-20245 Cisco telekomunikace energetika doprava finance obchod zdravotnictví US

21. 7. 2026 18:01 · Cisco PSIRT · Cisco Catalyst SD-WAN Controller, Catalyst SD-WAN Manager, and Catalyst SD-WAN Validator Authenticated Privilege Escalation Vulnerability 24. 6. 2026 13:00 · Mandiant / Google TI · Zero-Day Exploitation of Vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN Manager

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The Indicators of Compromise section of this advisory includes Show Control Connections guidance to help with system checks. A vulnerability in the peering authentication in Cisco…

KEV ✓ EPSS 0.92 CVE-2026-20182 Cisco US

16. 6. 2026 19:39 · Cisco PSIRT · Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability