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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.

PUBLISHED Reserved 2025-10-08 | Published 2026-04-15 | Updated 2026-04-16 | Assigner cisco




CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Certificate Validation

Product status

Default status
unknown

39.7.7
affected

39.9
affected

40.4.10
affected

39.6
affected

40.6.2
affected

39.8.2
affected

39.8.4
affected

40.1
affected

39.11
affected

39.7.4
affected

39.9.1
affected

40.4
affected

40.6
affected

39.7
affected

39.8
affected

39.8.3
affected

40.2
affected

39.10
affected

42.6
affected

42.7
affected

42.8
affected

42.9
affected

42.10
affected

42.11
affected

42.12
affected

43.1
affected

43.2
affected

43.3
affected

43.4
affected

43.4.1
affected

43.4.2
affected

43.5.0
affected

43.6.0
affected

43.6.1
affected

43.7
affected

43.8
affected

43.9
affected

43.10
affected

43.11
affected

43.12
affected

44.1
affected

44.2
affected

44.3
affected

44.4
affected

44.5
affected

44.6
affected

44.7
affected

44.8
affected

44.9
affected

44.10
affected

44.11
affected

44.12
affected

45.1
affected

45.2
affected

45.3
affected

45.4
affected

References

sec.cloudapps.cisco.com/.../cisco-sa-webex-cui-cert-8jSZYhWL (cisco-sa-webex-cui-cert-8jSZYhWL)

cve.org (CVE-2026-20184)

nvd.nist.gov (CVE-2026-20184)

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