Warning over Adobe Flash vulnerability revealed by Hacking Team leak

Tech company promises patch within a day for major new flaw uncovered by leak of 400GB of documents from hacking firm

An unpatched security flaw in Adobe Flash, discovered then kept secret by Italian cyber-surveillance firm Hacking Team, is now being used by malware developers to hack victims' computers following the leak of over 400GB of data from the company's servers.

Adobe, which says it expects to publish a patch for the vulnerability at some point on Wednesday, warns that "successful exploitation could cause a crash and potentially allow an attacker to take control of the affected system".