CVE-2021-1526: Cisco Webex Player

High severity, CVSS 7.8. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability in Cisco Webex Player for Windows and MacOS could allow an attacker to execute arbitrary code on an affected system. This vulnerability is due to insufficient validation of values in Webex recording files that are in Webex Recording Format (WRF). An attacker could exploit this vulnerability by sending a user a malicious WRF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the targeted user.

Affected products

• Cisco Webex Player: before 41.5 (fixed in 41.5)

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