Mozilla is working to fix a browser flaw that could give attackers unauthorized access to data on a victim's machine.

A noted security researcher disclosed four new zero-day vulnerabilities in Microsoft and Mozilla's browsers, including a critical flaw in Internet Explorer (IE) and a major bug in Firefox.

"Mozilla ponies up a patch for yet another critical flaw in Firefox, the latest embarrassment in a lengthening list this month for the open-source browser."

When a vulnerability researcher discloses a flaw in a widely-used operating system or application, some IT professionals question the motive. Such has been the case with a Linux Kernel flaw that was disclosed last week.

Officials at Mozilla said they have released an update to fix a flaw in the recently released 2.0.0.10 version of their Firefox browser.

A hacker’s just exposed a Mozilla Firefox security flaw - one that makes phishing far too easy and clueless Net users far too vulnerable.

Online attack code has been released targeting a critical, unpatched flaw in the Firefox browser.

In an interesting twist on browser-based security issues, security researchers said they have found a flaw in which Microsoft's Internet Explorer can cause Mozilla's Firefox to execute remote malicious code. Security firm Secunia released an advisory Tuesday, ranking the flaw as highly critical. The vulnerability is confirmed on Firefox 2.0.0.4 on a fully-patched version of Windows XP SP2.

Mozilla chief evangelist Mike Shaver says the latest Firefox information leakage bug warning is exaggerated.