Zoom says it has fixed a security issue that would have let hackers manipulate organizations’ custom URLs for the service and send legitimate-seeming meeting invitations. If a victim accepted the invitation and attended the meeting, the phony caller may have been able to inject malware into their device or carry out a phishing attack.

Hackers could have taken advantage of the exploit in two ways. One involved changing a vanity URL (i.e. http://[whatever].zoom.com) to include a direct link to a phony meeting. The other centered around targeting an organization’s own Zoom web interface, and urging a victim to enter their meeting ID into a malicious vanity URL instead. A video shared by Zoom and Check Point Research, which helped identify and resolve the issue, shows how the exploit worked.

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