via BetaNews.com:

Security firm Secunia has issued a "highly critical" advisory that details 10 separate vulnerabilities found in Mozilla, Firefox and Thunderbird. The flaws can be exploited remotely, allowing an attacker to compromise a system and expose sensitive data. Mozilla users are urged to upgrade to the latest releases of each application, which contain the necessary fixes.

This follows a JPEG vulnerability annmouncement (MS04-028) from Microsoft, as well. If you are running any of these programs, be sure to get the latest versions - these are serious vulnerabilities in all the apps, just as important to patch as where there's a vulnerability discovered in Windows or IE.

Cory over at SANS commented on the situation, too.