Valve said that the data leakage did not lead to security violation and did not require changes in user passwords. The leakage included old text messages with steam accounts, payment data, or uniform codes that are not related to passwords.
Valve will need to be approved in E -Mail or Steam messages when E -mail or password changes via SMS. The company recommends not to change passwords or phone numbers, not to pay attention to the security of the account and to install Steam Mobile Authenticator to send secure messages.
Source: Ferra

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