Professional social network LinkedIn is investigating reports that user passwords have been compromised.
Reports first surfaced Tuesday morning that a Russian blog had posted passwords of approximately 6.5 million users. Later in the morning on Twitter the LinkedIn account tweeted that the company was looking into the situation.
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A blog post from security firm Sophos reports that researchers there found a file that contains some passwords from LinkedIn, but not associated email addresses. Nonetheless, the firm recommends users to change their LinkedIn passwords for protection. "A file containing 6,458,020 SHA-1 unsalted password hashes has been posted on the internet, and hackers are working together to crack them," the site says.
LinkedIn says to "stay tuned" for more information.