In an email sent to MacMinute, security firm Secunia says that Apple’s Security Update released last Friday does not fully protect Mac users. “It is still possible to execute arbitrary code on a vulnerable user’s system, just as easy as before Apple issued Friday’s security update for Mac OS X,” notes Secunia. “We were pleased to learn that Apple issued a patch, which fixes the ‘help’ URI handler vulnerability, in just a week after the flaws were widely discussed in various public fora. Even though, they reportedly knew about the vulnerability back in February.”