A RA (Registration Authority)
account in Europe was compromised
last week (March 15, 2011) and
nine rogue SSL certificates were generated.

These rogue SSL certificates have been
revoked via a CRL (certificate revocation list)

Microsoft issued a Security Advisory March 23, 2011

On devices with automatic Windows Update enabled, it appears
the above CRL was imported into Internet Explorer.

It is also possible to manually add or check that the CRL
has been added to one’s browser –

Internet Explorer

Tools -> Options -> Content -> Certificates -> Untrusted Publishers

Firefox (3.x or 4.0)

Tools -> Options -> Advanced -> Encryption -> Revocation Lists