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Security researchers have discovered new Bluetooth security flaws that allow hackers to impersonate devices and perform man-in-the-middle attacks.
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The vulnerabilities impact all devices with Bluetooth 4.2 through Bluetooth 5.4, including laptops, PCs, smartphones, tablets, and others.
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Users can do nothing at the moment to fix the vulnerabilities, and the solution requires device manufacturers to make changes to the security mechanisms used by the technology.
Research paper: https://dl.acm.org/doi/pdf/10.1145/3576915.3623066
Depends on how often they contact each other, I guess. Is phone even needed to do so once you authorized the watch? Can you pay with your phone being anywhere else?