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For whatever reason you don't want an account, you may still report vulnerabilities – anonymously! However, if you want to participate in the coordination process, including discussions with vendors and researchers/reporters, then an account is required. VINCE was designed and created to encourage the interaction between vendors and reportsreporters. An potential benefit is that multi-vendor coordination efforts may be become more cooperative – with vendors assisting other vendors with sharing information on how to mitigate the vulnerability.
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