The disclosed computer-implemented method for assessing security risks of users of computer networks of organizations may include (i) detecting, at a risk computing device, a location of a host electronically accessed by a user computing device, the host location having an electronic address outside of a computer network of an organization, (ii) identifying, at the risk computing device, a host user credential sent to the host location from the user computing device, (iii) determining, at the risk computing device, that the host user credential matches an organization user credential associated with the organization's computer network, and (iv) calculating, at the risk computing device, a risk score for a user of the user computing device based on the determination that the host user credential matches the organization user credential. Various other methods, systems, and computer-readable media are also disclosed.
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