There was a bug in Skype that could cause messages to be sent to incorrect recipients (anyone, not only people from your contact list).

UI/UX Design by

We make sure that your target audience has the best possible experience with your digital product. You get:

• Design tailored to your audience
• Proven processes customized to your needs
• An expert team of experienced designers

Read more Show archive.org snapshot

If you were using Skype 4 on Linux (or Skype on any other platform), upgrade immediately Show archive.org snapshot .

I don't know if Skype 2 on Linux is affected.