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. 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 . This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL Security Impact Rating: Critical CVE: CVE-2026-20184
CSIRTS triage
- What
- A vulnerability could allow an unauthenticated attacker to impersonate any user within the service.
- Who is affected
- Organizations using trust anchors with their SSO integration in Cisco Webex Services.
- Urgency
- Critical urgency due to the risk of unauthorized access to services.
- Action
- Customers should take necessary action to update their SSO integration.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-20184
Get an email if CVE-2026-20184 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalCisco Webex Services Certificate Validation Vulnerabilitycisco-psirt · 2026-04-16
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-20184)