Google and the Yahoo Group announced Monday they are back online after an email security vulnerability was discovered and the company was hacked.
The vulnerabilities were discovered by security researchers, who were able to gain access to emails between a Yahoo and Google employee that were stored on an encrypted email server.
Yahoo said the breach is not affecting the security of Yahoo Mail users, and that Yahoo is aware of the issue.
Google said in a blog post that it was aware of an issue in the company’s email service, and has been working to fix it.
“We are currently in the process of investigating the issue and are working with our partners to fix the issue as quickly as possible,” Google said.
Yahoo Mail accounts are not linked to a specific company account, and accounts created with the email address “ymail” are automatically linked to the Yahoo Mail account, as are the accounts created by “googlemail” and the accounts generated by “yahoomail.”
Yahoo said it will notify Yahoo Mail customers in the next 48 hours.
The company said it is taking the threat seriously, and is working with its partners to patch the issue, and to update all Yahoo Mail accounts to address the issue immediately.
The company has also been testing other email providers for the vulnerability.