What’s Vulnerable › Vulnerabilities
CVE-2026-20184: Cisco Webex Meetings Certificate Validation Vulnerability
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-15 · updated 2026-10-26
- Weakness: CWE-295
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.
Affected products
- Cisco Webex Meetings: 39.7.7, 39.9, 40.4.10, 39.6, 40.6.2, 39.8.2 (+50)
References
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