Which action is critical if one suspects a data breach?

Taking immediate action to change all login details is critical if there is a suspicion of a data breach. This step helps to secure accounts and prevent unauthorized access by potential attackers who may have gained access to usernames, passwords, or personal information. By changing the login details, individuals can mitigate the risk of further damage and protect sensitive data.

In the case of informing media outlets, this step is generally not a priority when dealing with a potential data breach, as the most urgent concern is to secure accounts and assess the situation. Detailing online activities might not provide any direct benefit in managing a suspected breach and could even expose sensitive information. Delaying action until confirmation of a breach can lead to worsening security issues, as attackers could exploit the time without protections in place. Taking prompt action is always recommended in these scenarios.