Cisco Expressway: Critical Remote Command Execution Vulnerability

Cisco Expressway: Critical Remote Command Execution Vulnerability

Cisco disclosed CVE-2026-76466, a critical issue affecting vulnerable clustered Expressway-C and Expressway-E systems. Under Cisco's stated conditions, an attacker who can reach the database service and possesses the relevant persistent cookies may execute operating-system commands as root. The issue also involves insufficient client-certificate validation in clustering TLS settings.

Organizations should identify potentially affected clusters, review database-service network exposure and apply Cisco's fixed software. X15.5.3 and earlier are directed to X15.5.20; X14 and earlier must migrate. Cisco reports no workaround.

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