{"id":"CVE-2026-20184","state":"PUBLISHED","title":"Cisco Webex Meetings Certificate Validation Vulnerability","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.\r\n\r\nThis 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.","publishedAt":"2026-04-15T16:03:59.646Z","updatedAt":"2026-04-16T19:07:14.461Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Webex Meetings"],"affected":[{"vendor":"Cisco","product":"Cisco Webex Meetings","defaultStatus":"unknown","versions":[{"version":"39.7.7","status":"affected"},{"version":"39.9","status":"affected"},{"version":"40.4.10","status":"affected"},{"version":"39.6","status":"affected"},{"version":"40.6.2","status":"affected"},{"version":"39.8.2","status":"affected"},{"version":"39.8.4","status":"affected"},{"version":"40.1","status":"affected"},{"version":"39.11","status":"affected"},{"version":"39.7.4","status":"affected"},{"version":"39.9.1","status":"affected"},{"version":"40.4","status":"affected"},{"version":"40.6","status":"affected"},{"version":"39.7","status":"affected"},{"version":"39.8","status":"affected"},{"version":"39.8.3","status":"affected"},{"version":"40.2","status":"affected"},{"version":"39.10","status":"affected"},{"version":"42.6","status":"affected"},{"version":"42.7","status":"affected"},{"version":"42.8","status":"affected"},{"version":"42.9","status":"affected"},{"version":"42.10","status":"affected"},{"version":"42.11","status":"affected"},{"version":"42.12","status":"affected"},{"version":"43.1","status":"affected"},{"version":"43.2","status":"affected"},{"version":"43.3","status":"affected"},{"version":"43.4","status":"affected"},{"version":"43.4.1","status":"affected"},{"version":"43.4.2","status":"affected"},{"version":"43.5.0","status":"affected"},{"version":"43.6.0","status":"affected"},{"version":"43.6.1","status":"affected"},{"version":"43.7","status":"affected"},{"version":"43.8","status":"affected"},{"version":"43.9","status":"affected"},{"version":"43.10","status":"affected"},{"version":"43.11","status":"affected"},{"version":"43.12","status":"affected"},{"version":"44.1","status":"affected"},{"version":"44.2","status":"affected"},{"version":"44.3","status":"affected"},{"version":"44.4","status":"affected"},{"version":"44.5","status":"affected"},{"version":"44.6","status":"affected"},{"version":"44.7","status":"affected"},{"version":"44.8","status":"affected"},{"version":"44.9","status":"affected"},{"version":"44.10","status":"affected"},{"version":"44.11","status":"affected"},{"version":"44.12","status":"affected"},{"version":"45.1","status":"affected"},{"version":"45.2","status":"affected"},{"version":"45.3","status":"affected"},{"version":"45.4","status":"affected"}]}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL"],"weaknesses":["CWE-295"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20184.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20184","state":"PUBLISHED","datePublished":"2026-04-15T16:03:59.646Z","dateUpdated":"2026-04-16T19:07:14.461Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.394Z"},"containers":{"cna":{"title":"Cisco Webex Meetings Certificate Validation Vulnerability","descriptions":[{"lang":"en","value":"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.\r\n\r\nThis 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":[{"vendor":"Cisco","product":"Cisco Webex Meetings","defaultStatus":"unknown","versions":[{"version":"39.7.7","status":"affected"},{"version":"39.9","status":"affected"},{"version":"40.4.10","status":"affected"},{"version":"39.6","status":"affected"},{"version":"40.6.2","status":"affected"},{"version":"39.8.2","status":"affected"},{"version":"39.8.4","status":"affected"},{"version":"40.1","status":"affected"},{"version":"39.11","status":"affected"},{"version":"39.7.4","status":"affected"},{"version":"39.9.1","status":"affected"},{"version":"40.4","status":"affected"},{"version":"40.6","status":"affected"},{"version":"39.7","status":"affected"},{"version":"39.8","status":"affected"},{"version":"39.8.3","status":"affected"},{"version":"40.2","status":"affected"},{"version":"39.10","status":"affected"},{"version":"42.6","status":"affected"},{"version":"42.7","status":"affected"},{"version":"42.8","status":"affected"},{"version":"42.9","status":"affected"},{"version":"42.10","status":"affected"},{"version":"42.11","status":"affected"},{"version":"42.12","status":"affected"},{"version":"43.1","status":"affected"},{"version":"43.2","status":"affected"},{"version":"43.3","status":"affected"},{"version":"43.4","status":"affected"},{"version":"43.4.1","status":"affected"},{"version":"43.4.2","status":"affected"},{"version":"43.5.0","status":"affected"},{"version":"43.6.0","status":"affected"},{"version":"43.6.1","status":"affected"},{"version":"43.7","status":"affected"},{"version":"43.8","status":"affected"},{"version":"43.9","status":"affected"},{"version":"43.10","status":"affected"},{"version":"43.11","status":"affected"},{"version":"43.12","status":"affected"},{"version":"44.1","status":"affected"},{"version":"44.2","status":"affected"},{"version":"44.3","status":"affected"},{"version":"44.4","status":"affected"},{"version":"44.5","status":"affected"},{"version":"44.6","status":"affected"},{"version":"44.7","status":"affected"},{"version":"44.8","status":"affected"},{"version":"44.9","status":"affected"},{"version":"44.10","status":"affected"},{"version":"44.11","status":"affected"},{"version":"44.12","status":"affected"},{"version":"45.1","status":"affected"},{"version":"45.2","status":"affected"},{"version":"45.3","status":"affected"},{"version":"45.4","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL","name":"cisco-sa-webex-cui-cert-8jSZYhWL"}],"metrics":[{"format":"cvssV3_1","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","lang":"en","description":"Improper Certificate Validation","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-04-16T19:07:14.461Z"},"exploits":[{"lang":"en","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"source":{"advisory":"cisco-sa-webex-cui-cert-8jSZYhWL","discovery":"INTERNAL","defects":["CSCwt37111"]}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-15T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-20184"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-16T03:55:32.095Z"}}]}}}