Vulnerability in Cisco Webex Meetings
CVE-2026-20184
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.
Vulnerability class: Improper Certificate Validation
EPSS: 0.005 (42.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Cisco Webex Meetings — versions 39.7.7, 39.9, 40.4.10
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20184?
- CVE-2026-20184 is a critical-severity vulnerability in Cisco Webex Meetings, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2026-04-15.
- How severe is CVE-2026-20184?
- Critical severity. CVSS v3 base score is 9.8 out of 10.