Google issued a serious warning to approximately 2.5 billion Gmail users to update their passwords following a wave of successful hacker breaches .
This request comes after a third-party data breach at software company Salesforce that has created new opportunities for cybercriminals .
The hacker group ShinyHunters impersonated Google support staff through fraudulent phone calls, deceiving users into revealing sensitive information .
Hackers use fake emails and phishing links to redirect users to counterfeit login pages where credentials are stolen .
Google emphasized that its core systems remain secure, but the Salesforce breach has provided hackers with valuable contact information for targeted attacks .
The company recommends users enable two-factor authentication and remain vigilant against suspicious emails and requests .
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