Cisco Patches CVSS 10.0 Secure Workload REST API Flaw Enabling Data Access
May 22, 2026
Vulnerability / Network Security
Cisco has rolled out updates for a maximum-severity security flaw impacting Secure Workload that could allow an unauthenticated, remote attacker to access sensitive data. Tracked as CVE-2026-20223 (CVSS score: 10.0), the vulnerability arises from insufficient validation and authentication when accessing REST API endpoints. "An attacker could exploit this vulnerability if they are able to send a crafted API request to an affected endpoint," Cisco said . "A successful exploit could allow the attacker to read sensitive information and make configuration changes across tenant boundaries with the privileges of the Site Admin user." The shortcoming impacts Cisco Secure Workload Cluster Software on SaaS and on-prem deployments, regardless of device configuration. Cisco said there are no workarounds that address the vulnerability. The issue has been addressed in the following versions - Cisco Secure Workload Release 3.9 and earlier (Migrate to a fixed releas...