【Vulnerability Alert】A Critical Security Vulnerability Has Been Identified in Cisco Webex Services (CVE-2026-20184)

publish date : 2026-04-24 update date : 2026-04-24

Source: Ministry of education information & communication security contingency platform

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Publication Number	TACERT-ANA-2026041709042929	Publication Time	2026/04/17 09:47
Incident Type	ANA-Vulnerability Alert	Discovery Time	2026/04/17 09:47
Impact Level	Low
[Subject] 【Vulnerability Alert】A Critical Security Vulnerability Has Been Identified in Cisco Webex Services (CVE-2026-20184)
[Content] Forwarded from TWCERTCC-200-202604-00000019 Cisco recently issued a critical security vulnerability advisory (CVE-2026-20184, CVSS: 9.8). This vulnerability is caused by improper certificate validation. During the integration process between single sign-on (SSO) and Control Hub in Cisco Webex Services, it may allow an unauthenticated remote attacker to impersonate any user in the service. (Information Sharing Level: WHITE (Information content can be publicly disclosed)
[Affected Platform] When Cisco Webex Services is configured to integrate with Control Hub through SSO.
[Recommended Actions] Please apply the remediation in accordance with the solution provided on the official website. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL
[Reference] ttps://www.twcert.org.tw/tw/cp-169-10850-80e46-1.html

(This notification is for informational purposes only and does not constitute a cybersecurity incident).
If you have questions or suggestions regarding this notification, please feel free to contact us.
Ministry of education information & communication security contingency platform
Website: https://info.cert.tanet.edu.tw/
Phone: +886-7-5250211
Internet Phone: 98400000
E-Mail: service@cert.tanet.edu.tw

Organizer: Computer Center

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