cisco-sa-webex-cui-cert-8jSZYhWLCriticalCVSS 9.8

Cisco Webex Services Certificate Validation Vulnerability

Published
April 15, 2026
Last Modified
April 16, 2026

🔗 CVE IDs covered (1)

CVE-2026-20184 →

📋 Description

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.

Cisco has addressed this vulnerability in the Cisco Webex service. However, customer action is necessary for affected organizations that are using trust anchors with their SSO integration.

There are no workarounds that address this vulnerability.

To avoid service interruption, customers who are using trust anchors with their SSO integration should upload a new identity provider (IdP) SAML certificate to Control Hub. For more information, see Manage single sign-on integration in Control Hub ["https://help.webex.com/en-us/article/nstvmyo/Manage-single-sign-on-integration-in-Control-Hub#Cisco_Task_in_List_GUI.dita_07fbdc21-41a0-482f-99dc-b8c17adbd087"].

CVE-2026-20184 — Cisco Webex Meetings Certificate Validation Vulnerability (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

🎯 Affected products57

  • Cisco Webex Meetings
  • Cisco Webex Meetings 39.10
  • Cisco Webex Meetings 39.11
  • Cisco Webex Meetings 39.6
  • Cisco Webex Meetings 39.7
  • Cisco Webex Meetings 39.7.4
  • Cisco Webex Meetings 39.7.7
  • Cisco Webex Meetings 39.8
  • Cisco Webex Meetings 39.8.2
  • Cisco Webex Meetings 39.8.3
  • Cisco Webex Meetings 39.8.4
  • Cisco Webex Meetings 39.9
  • Cisco Webex Meetings 39.9.1
  • Cisco Webex Meetings 40.1
  • Cisco Webex Meetings 40.2
  • Cisco Webex Meetings 40.4
  • Cisco Webex Meetings 40.4.10
  • Cisco Webex Meetings 40.6
  • Cisco Webex Meetings 40.6.2
  • Cisco Webex Meetings 42.10
  • Cisco Webex Meetings 42.11
  • Cisco Webex Meetings 42.12
  • Cisco Webex Meetings 42.6
  • Cisco Webex Meetings 42.7
  • Cisco Webex Meetings 42.8
  • Cisco Webex Meetings 42.9
  • Cisco Webex Meetings 43.1
  • Cisco Webex Meetings 43.10
  • Cisco Webex Meetings 43.11
  • Cisco Webex Meetings 43.12
  • +27 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (3)