Security notice

On August 31, an unauthorized party gained access to the VOSviewer website. As a result, a malicious version of the VOSviewer Windows executable was available for download on August 31 between 3:30 and 13:20 CEST. Only users who downloaded the Windows executable during this time period are at risk. If you did so, we strongly recommend deleting the downloaded file immediately, running a full antivirus scan, and taking any additional security precautions in accordance with your organization's security policy.

The incident was detected quickly by the Security Operations Centre at Leiden University, and immediate mitigation measures were taken to contain the incident and limit its potential impact. A detailed investigation is currently ongoing in collaboration with cybersecurity partners, including SURFcert. Users who will be identified as downloaders or users of the malicious version will be notified directly.

We will provide further updates as soon as more information becomes available. We sincerely apologize for the inconvenience and appreciate your understanding.