The consultant, Levent Kayan, based in Berlin, Link Removed - Invalid URL on Wednesday and notified Skype a day later. He said on Friday he hasn't heard a response yet.
The problem lies in a field where a person can input their mobile phone number. Kayan wrote that a malicious user can insert JavaScript into the mobile phone field of their profile.
When one of their contacts comes online, the malicious user's profile will be updated, and the JavaScript will be executed when the other contact logs in. Kayan wrote that the other person's session could be hijacked, and it may be possible to gain control of that person's computer. An attacker could also change the password on someone's account.
