CVE-2026-20233
A vulnerability in the web-based user interface of Cisco Webex Meetings could have allowed an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack. Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. A successful exploit could have allowed the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information. As mentioned, Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is necessary to update on-premises software or devices. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-jw3NeQzS Security Impact Rating: Medium CVE: CVE-2026-20233
CSIRTS triage
- What
- A cross-site scripting vulnerability could allow an attacker to execute arbitrary script code.
- Who is affected
- Users of Cisco Webex Meetings.
- Urgency
- Remediation is important as it could lead to unauthorized access to sensitive information.
- Action
- No action needed as Cisco has addressed the vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.
Advisory coverage (1)
- mediumCisco Webex Meetings Cross-Site Scripting Vulnerabilitycisco-psirt · 2026-06-03
External references
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