CVE-2026-20184
Cisco Webex Meetings Certificate Validation Vulnerability
CVSS Score
9.8
EPSS Score
0.1%
EPSS Percentile
16th
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.
| CWE | CWE-295 |
| Vendor | cisco |
| Product | cisco webex meetings |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Apr 15, 2026 |
| Last Updated | Apr 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Cisco / Cisco Webex Meetings
39.7.7 39.9 40.4.10 39.6 40.6.2 39.8.2 39.8.4 40.1 39.11 39.7.4 39.9.1 40.4 40.6 39.7 39.8 39.8.3 40.2 39.10 42.6 42.7 42.8 42.9 42.10 42.11 42.12 43.1 43.2 43.3 43.4 43.4.1 43.4.2 43.5.0 43.6.0 43.6.1 43.7 43.8 43.9 43.10 43.11 43.12 44.1 44.2 44.3 44.4 44.5 44.6 44.7 44.8 44.9 44.10 44.11 44.12 45.1 45.2 45.3 45.4