A security firm has warned of a vulnerability in Safari that allows hackers to hijack confidential data entered into Web sites.

Secunia says the flaws affect Safari, Mozilla and Firefox, Opera, AOL's Netscape, and the Linux-based Konqueror. The flaws open up a spoofing avenue that attackers can exploit to rip off information, according to Secunia.

All the affected browsers share one feature – tabbed windows. The vulnerabilities allow hackers to extract information entered into a dialogue box in one window but make it seem as if it's actually appearing in another. Another bug allows a site open in one tab to grab information typed into forms on a site open in a second, explains TechWeb.

Secunia's advice is that users should either disable JavaScript within their browsers, or not visit financial institutions or retail sites when untrusted sites are also open.