By Raphael SatterWASHINGTON, July 30 (Reuters) - Alphabet-owned cybersecurity company Wiz said on Thursday it had found a sweeping flaw that could have compromised Microsoft ‌and thousands of its cloud customers. "When you build in the cloud, and when ​it's on ​Microsoft, it's usually in CosmosDB," said Ami ​Luttwak, Wiz chief technology officer. Last year, researcher Dirk-jan Mollema discovered a flaw, also since patched, that could have allowed the mass hijacking of Microsoft cloud users' accounts. Outside researchers ‌said the flaw discovered by Wiz was serious. And had a hacker found the one in CosmosDB before Wiz had, "they ​most definitely could have caused some pretty serious damage."