Cisco Webex Meetings Certificate Validation Vulnerability
Summary
| CVE | CVE-2026-20184 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-15 17:17:03 UTC |
| Updated | 2026-04-15 17:17:03 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Problem Types: CWE-295 | CWE-295 Improper Certificate Validation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSSV3_1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | Cisco Webex Meetings | affected 39.7.7 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.9 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 40.4.10 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.6 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 40.6.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.8.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.8.4 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 40.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.11 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.7.4 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.9.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 40.4 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 40.6 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.7 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.8 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.8.3 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 40.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 39.10 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.6 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.7 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.8 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.9 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.10 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.11 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 42.12 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.3 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.4 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.4.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.4.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.5.0 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.6.0 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.6.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.7 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.8 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.9 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.10 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.11 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 43.12 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.3 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.4 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.5 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.6 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.7 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.8 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.9 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.10 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.11 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 44.12 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 45.1 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 45.2 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 45.3 | Not specified |
| CNA | Cisco | Cisco Webex Meetings | affected 45.4 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-... | [email protected] | sec.cloudapps.cisco.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Exploits
CNA: 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.
There are currently no legacy QID mappings associated with this CVE.