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CVE-2026-20184

See advisory•CRITICAL · CVSS 9.8•No exploitation reported

What is 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 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.

CVSS9.8 NVD 3.1

SeverityCRITICAL

ExploitationNo exploitation reported

EPSS1% · P43

Triage statusNo Known Exploit

ActionPatch within 48 hours

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

CWECWE-295

NVD published2026-04-15

NVD last modified2026-06-17

Timeline

2026-04-15Published to the U.S. National Vulnerability Database (NVD)
2026-04-17First covered in a defend.network daily briefing
2026-06-17NVD record last updated

Affected product

See advisory

References

Referenced in our briefings & reports

Apache ActiveMQ exploited; Defender zero-day; ZionSiphon hits water (2026-04-17)

Related vulnerabilities

CVE-2026-85102 – Check Point Multiple Products (same weakness: CWE-295)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.