Software vulnerability brokers are reportedly in possession of two zero-day Zoom video conferencing app exploits – one affecting Windows clients and the other impacting OS X clients – and they are looking to sell.

The Zoom for Windows vulnerability is a remote code execution bug that the hackers are offering for a hefty sum of $500,000, Motherboard/Vice has reported, citing three separate sources. The MacOs is not an RCE flaw and therefore is less critical and more difficult to leverage in an attack.

The Windows exploit reportedly would enable unauthorized access to the Zoom app, potentially allowing malicious actors, pranksters or corporate spies to join a call, albeit not in a particularly covert manner. Access to the machine running the app would require a second bug used in conjunction.

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