Social networking website LinkedIn is questioning claims that over 6 million of its users' passwords have been leaked onto the internet.
Hackers posted a record containing encrypted passwords onto a Russian web forum.
They have invited the hacking residents to help with decryption.
LinkedIn, that has over 150 million users, has not expelled a grave statement, but tweeted : "Our group is now seeking in to reports."
Later, it added: "Our group continues to investigate, but at this time you are still not able to to approve that any safety crack has taken place."
Security assistant professor Graham Cluley told the BBC he believed the crack was genuine.
"We've fixed there are LinkedIn passwords in the data.
"We did this by probing by the information for (hashed) passwords that you at Sophos use usually on LinkedIn. We found the passwords in the data. We moreover saw that hundreds of the passwords enclose the word 'Linkedin'.
"Our recommendation is to change your LinkedIn password. And if you use the same cue on other accounts, change it there too."
The headlines comes as LinkedIn was forced to refurbish its mobile app after a privacy smirch was unclosed by safety researchers.
Skycure Security mentioned the the mobile app was sending unencrypted monthly calendar entries to LinkedIn servers without users' knowledge.
The information enclosed discussion notes, that frequently enclose information such as dialling figures and passcodes for conference calls.
In reply LinkedIn mentioned it would "no longer send information from the discussion records division of your calendar".
The firm stressed that the monthly calendar function was an opt-in feature.
However, the researchers who unclosed the smirch mentioned the delivery of the information to LinkedIn's servers was completed without a "clear denote from the app to the user".
In a matter posted on the company's blog , LinkedIn's mobile product head Joff Redfern mentioned a new "learn more" couple would be updated to the app so users have a clearer photo about how their information is being used and transmitted.
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