Adobe is aware of recently published security issues in the Illustrator CS2 Macintosh version that could potentially cause code execution. An attacker would need to convince a user to open a malicious AI file in Illustrator CS2 on Macintosh to successfully exploit the issue. Adobe recommends that customers exercise caution when receiving unsolicited or suspicious files. Adobe is not aware of any information to indicate that this vulnerability has been publicly used to attack customers.
These issues do not affect Illustrator CS3 or the upcoming Illustrator CS4 release.
More information here.