CVE-2021-1221: Cisco Webex Meetings

Medium severity, CVSS 4.1. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability in the user interface of Cisco Webex Meetings and Cisco Webex Meetings Server Software could allow an authenticated, remote attacker to inject a hyperlink into a meeting invitation email. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by entering a URL into a field in the user interface. A successful exploit could allow the attacker to generate a Webex Meetings invitation email that contains a link to a destination of their choosing. Because this email is sent from a trusted source, the recipient may be more likely to click the link.

Affected products

• Cisco Webex Meetings: before 41.1.0 (fixed in 41.1.0)
• Cisco Webex Meetings Server: before 3.0 (fixed in 3.0); version 3.0 only; version 4.0 only

Published 2021-02-04. Last modified 2026-06-17.