Platform
cisco
Component
webex-meetings
Fixed in
39.7.8
39.9.1
40.4.11
39.6.1
40.6.3
39.8.3
39.8.5
40.1.1
39.11.1
39.7.5
39.9.2
40.4.1
40.6.1
39.7.1
39.8.1
39.8.4
40.2.1
39.10.1
42.6.1
42.7.1
42.8.1
42.9.1
42.10.1
42.11.1
42.12.1
43.1.1
43.2.1
43.3.1
43.4.1
43.4.2
43.4.3
43.5.1
43.6.1
43.6.2
43.7.1
43.8.1
43.9.1
43.10.1
43.11.1
43.12.1
44.1.1
44.2.1
44.3.1
44.4.1
44.5.1
44.6.1
44.7.1
44.8.1
44.9.1
44.10.1
44.11.1
44.12.1
45.1.1
45.2.1
45.3.1
45.4.1
CVE-2026-20184 is a critical vulnerability affecting the integration of single sign-on (SSO) with Control Hub in Cisco Webex Meetings. A remote, unauthenticated attacker could exploit this flaw to impersonate any user within the service, potentially leading to significant data breaches and service disruption. This vulnerability impacts versions 39.6 through 45.4 of Webex Meetings, and Cisco has released a patch to address the issue.
CVE-2026-20184 in Cisco Webex Meetings represents a critical risk due to its potential for impersonation. An unauthenticated, remote attacker could exploit this flaw in the single sign-on (SSO) integration with Control Hub to impersonate any user within the service. The CVSS score is rated 9.8, indicating a severe impact. The root cause is improper certificate validation, allowing an attacker to present a crafted token to gain unauthorized access. The lack of a fix available exacerbates the situation, leaving organizations vulnerable until alternative mitigation measures are implemented. The absence of an official Cisco KEV (Knowledge Base Entry Vulnerability) further hinders risk assessment and detailed information availability.
An attacker could exploit this vulnerability by connecting to a Webex service endpoint and providing a specially crafted token. The deficient certificate validation allows this fraudulent token to be accepted, granting the attacker access to another user's account. This access could be used to steal confidential information, disrupt meetings, or even compromise the entire organization's security. The remote and unauthenticated nature of the exploitation makes it particularly dangerous, as an attacker could operate from any location without needing initial credentials. The lack of a KEV makes it difficult to fully understand the exploitation techniques, but the vulnerability description suggests an attack based on token manipulation.
Exploit Status
EPSS
0.07% (21% percentile)
CISA SSVC
CVSS Vector
Given that Cisco has not provided a direct fix for CVE-2026-20184, organizations using Cisco Webex Meetings should implement immediate mitigation measures. We strongly recommend reviewing and strengthening SSO security policies, including implementing multi-factor authentication (MFA) for all users. Furthermore, closely monitor Webex audit logs for suspicious activity or unauthorized access attempts. Consider network segmentation to limit access to Control Hub services. While there is no official solution, implementing these measures can significantly reduce the risk of exploitation. Stay updated on any Cisco announcements and seek alternative solutions or unofficial patches with caution.
Actualice Cisco Webex Meetings a una versión corregida para mitigar la vulnerabilidad de validación de certificados. Consulte la advisory de Cisco (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL) para obtener instrucciones específicas y versiones corregidas.
Vulnerability analysis and critical alerts directly to your inbox.
It indicates a critical vulnerability with a high potential for exploitation and a significant impact.
Cisco has not yet released a fix for this vulnerability. We recommend monitoring Cisco updates.
SSO (Single Sign-On) allows users to access multiple applications with a single set of credentials. This vulnerability affects the security of this process.
Control Hub is a centralized management platform for Cisco Webex Services.
Review your Webex SSO configuration and monitor audit logs for suspicious activity.
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