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critical advisory

Critical Certificate Validation Vulnerability in CISCO Webex Allows User Impersonation

A critical improper certificate validation vulnerability in CISCO Webex versions 39.6 - 45.4 (CVE-2026-20184) allows a remote, unprivileged attacker to impersonate users, gain unauthorized access, and join meetings without authorization, potentially impacting confidentiality, integrity, and availability.

cisco webex sso certificate-validation user-impersonation cve-2026-20184 cloud
2r 3t 1c
critical advisory

Cisco Webex Services SSO Impersonation Vulnerability (CVE-2026-20184)

CVE-2026-20184 allows an unauthenticated, remote attacker to impersonate any user in Cisco Webex Services by exploiting improper certificate validation in single sign-on (SSO) integration with Control Hub, potentially granting unauthorized access.

Webex Services cve-2026-20184 webex sso impersonation authentication
2r 1t 1c