CVE-2026-20184 CRITICAL

CVE-2026-20184: Cisco Webex Meetings Certificate Validation Vulnerability

Vendor Cisco
Product Cisco Webex Meetings
Weakness CWE-295
Published April 15, 2026
Last update April 16, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, remote attacker to impersonate any user within the service. This vulnerability existed because of improper certificate validation. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by connecting to a service endpoint and supplying a crafted token. A successful exploit could have allowed the attacker to gain unauthorized access to legitimate Cisco Webex services.

Key dates

02Disclosure timeline

April 15, 2026 CVE published
April 16, 2026 Record updated