What is CVE-2026-20184?

CVE-2026-20184 is a critical-severity vulnerability in Cisco Webex Meetings, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2026-04-15.

How severe is CVE-2026-20184?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Cisco Webex Meetings

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…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (14.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cisco Webex Meetings — versions 39.7.7, 39.9, 40.4.10

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

cisco-sa-webex-cui-cert-8jSZYhWL

Frequently asked questions

What is CVE-2026-20184?: CVE-2026-20184 is a critical-severity vulnerability in Cisco Webex Meetings, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2026-04-15.
How severe is CVE-2026-20184?: Critical severity. CVSS v3 base score is 9.8 out of 10.