Cisco Webex Meetings Certificate Validation Vulnerability_CVE-2026-20184

9.8 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

AI Analysis

AI processing failed - invalid JSON response

Basic Information

ID CVE-2026-20184

Source cisco

Published Apr 15, 2026 at 16:03

Modified Apr 15, 2026 at 16:56

Affected Product

Vendor Cisco

Product Cisco Webex Meetings

Version 39.7.7

Affected Versions Cisco Cisco Webex Meetings 39.7.7
Cisco Cisco Webex Meetings 39.9
Cisco Cisco Webex Meetings 40.4.10
Cisco Cisco Webex Meetings 39.6
Cisco Cisco Webex Meetings 40.6.2
Cisco Cisco Webex Meetings 39.8.2
Cisco Cisco Webex Meetings 39.8.4
Cisco Cisco Webex Meetings 40.1
Cisco Cisco Webex Meetings 39.11
Cisco Cisco Webex Meetings 39.7.4
Cisco Cisco Webex Meetings 39.9.1
Cisco Cisco Webex Meetings 40.4
Cisco Cisco Webex Meetings 40.6
Cisco Cisco Webex Meetings 39.7
Cisco Cisco Webex Meetings 39.8
Cisco Cisco Webex Meetings 39.8.3
Cisco Cisco Webex Meetings 40.2
Cisco Cisco Webex Meetings 39.10
Cisco Cisco Webex Meetings 42.6
Cisco Cisco Webex Meetings 42.7
Cisco Cisco Webex Meetings 42.8
Cisco Cisco Webex Meetings 42.9
Cisco Cisco Webex Meetings 42.10
Cisco Cisco Webex Meetings 42.11
Cisco Cisco Webex Meetings 42.12
Cisco Cisco Webex Meetings 43.1
Cisco Cisco Webex Meetings 43.2
Cisco Cisco Webex Meetings 43.3
Cisco Cisco Webex Meetings 43.4
Cisco Cisco Webex Meetings 43.4.1
Cisco Cisco Webex Meetings 43.4.2
Cisco Cisco Webex Meetings 43.5.0
Cisco Cisco Webex Meetings 43.6.0
Cisco Cisco Webex Meetings 43.6.1
Cisco Cisco Webex Meetings 43.7
Cisco Cisco Webex Meetings 43.8
Cisco Cisco Webex Meetings 43.9
Cisco Cisco Webex Meetings 43.10
Cisco Cisco Webex Meetings 43.11
Cisco Cisco Webex Meetings 43.12
Cisco Cisco Webex Meetings 44.1
Cisco Cisco Webex Meetings 44.2
Cisco Cisco Webex Meetings 44.3
Cisco Cisco Webex Meetings 44.4
Cisco Cisco Webex Meetings 44.5
Cisco Cisco Webex Meetings 44.6
Cisco Cisco Webex Meetings 44.7
Cisco Cisco Webex Meetings 44.8
Cisco Cisco Webex Meetings 44.9
Cisco Cisco Webex Meetings 44.10
Cisco Cisco Webex Meetings 44.11
Cisco Cisco Webex Meetings 44.12
Cisco Cisco Webex Meetings 45.1
Cisco Cisco Webex Meetings 45.2
Cisco Cisco Webex Meetings 45.3
Cisco Cisco Webex Meetings 45.4

References

sec.cloudapps.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL

{
    "lastseen": "",
    "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.",
    "published": "2026-04-15T16:03:59.646Z",
    "modified": "2026-04-15T16:56:34.703Z",
    "type": "cve",
    "title": "Cisco Webex Meetings Certificate Validation Vulnerability",
    "source": "cisco",
    "references": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL",
    "id": "CVE-2026-20184",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Cisco Cisco Webex Meetings 39.7.7\nCisco Cisco Webex Meetings 39.9\nCisco Cisco Webex Meetings 40.4.10\nCisco Cisco Webex Meetings 39.6\nCisco Cisco Webex Meetings 40.6.2\nCisco Cisco Webex Meetings 39.8.2\nCisco Cisco Webex Meetings 39.8.4\nCisco Cisco Webex Meetings 40.1\nCisco Cisco Webex Meetings 39.11\nCisco Cisco Webex Meetings 39.7.4\nCisco Cisco Webex Meetings 39.9.1\nCisco Cisco Webex Meetings 40.4\nCisco Cisco Webex Meetings 40.6\nCisco Cisco Webex Meetings 39.7\nCisco Cisco Webex Meetings 39.8\nCisco Cisco Webex Meetings 39.8.3\nCisco Cisco Webex Meetings 40.2\nCisco Cisco Webex Meetings 39.10\nCisco Cisco Webex Meetings 42.6\nCisco Cisco Webex Meetings 42.7\nCisco Cisco Webex Meetings 42.8\nCisco Cisco Webex Meetings 42.9\nCisco Cisco Webex Meetings 42.10\nCisco Cisco Webex Meetings 42.11\nCisco Cisco Webex Meetings 42.12\nCisco Cisco Webex Meetings 43.1\nCisco Cisco Webex Meetings 43.2\nCisco Cisco Webex Meetings 43.3\nCisco Cisco Webex Meetings 43.4\nCisco Cisco Webex Meetings 43.4.1\nCisco Cisco Webex Meetings 43.4.2\nCisco Cisco Webex Meetings 43.5.0\nCisco Cisco Webex Meetings 43.6.0\nCisco Cisco Webex Meetings 43.6.1\nCisco Cisco Webex Meetings 43.7\nCisco Cisco Webex Meetings 43.8\nCisco Cisco Webex Meetings 43.9\nCisco Cisco Webex Meetings 43.10\nCisco Cisco Webex Meetings 43.11\nCisco Cisco Webex Meetings 43.12\nCisco Cisco Webex Meetings 44.1\nCisco Cisco Webex Meetings 44.2\nCisco Cisco Webex Meetings 44.3\nCisco Cisco Webex Meetings 44.4\nCisco Cisco Webex Meetings 44.5\nCisco Cisco Webex Meetings 44.6\nCisco Cisco Webex Meetings 44.7\nCisco Cisco Webex Meetings 44.8\nCisco Cisco Webex Meetings 44.9\nCisco Cisco Webex Meetings 44.10\nCisco Cisco Webex Meetings 44.11\nCisco Cisco Webex Meetings 44.12\nCisco Cisco Webex Meetings 45.1\nCisco Cisco Webex Meetings 45.2\nCisco Cisco Webex Meetings 45.3\nCisco Cisco Webex Meetings 45.4",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Cisco Webex Meetings",
    "version": "39.7.7",
    "vendor": "Cisco",
    "ai_description": "AI processing failed - invalid JSON response",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}