Date: 09/27/05 (Opera Browser)    Keywords: security

Opera 8.x
Advisories: 8
Highest Criticality: Moderate
Impact: Spoofing, Cross Site Scripting, Security Bypass.
Status: 100% patched

Firefox 1.x
Advisories: 24
Highest Criticality: Extreme
Impact: System access, DoS, Privilege escalation, Exposure sensitive info, Exposure system info, Manipulation of data, Spoofing, Cross Site Scripting, Security bypass, Hijacking.
Status: 83% patched

Internet Explorer 6.x
Advisories: 86
Highest Criticality: Extreme
Impact: System access, DoS, Exposure sensitive info, Exposure system info, Manipulation of data, Spoofing, Cross Site Scripting, Security bypass, Hijacking.
Status: 56% patched

Source: http://community.livejournal.com/opera_browser/44591.html