CVE-2026-20184 Cisco Webex Meetings Certificate Validation Vulnerability
An unauthenticated remote attacker can impersonate any user in Cisco Webex Services by exploiting improper certificate validation in SSO integration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20184?
CVE-2026-20184 is a critical authentication bypass vulnerability in Cisco Webex Meetings, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2026-20184?
How do I fix CVE-2026-20184?
No fix has been published for CVE-2026-20184 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-20184 being exploited?
There is no known exploitation of CVE-2026-20184 in the wild and no public exploit code.
Sources
Also known as GHSA-hh5g-g7m5-5vxv.