bugzilla -- multiple vulnerabilities

A Bugzilla Security Advisory reports:

The following security issues have been discovered in
Bugzilla:
Information Leak
Versions: 4.1.1 to 4.2.1, 4.3.1
In HTML bugmails, all bug IDs and attachment IDs are
linkified, and hovering these links displays a tooltip
with the bug summary or the attachment description if
the user is allowed to see the bug or attachment.
But when validating user permissions when generating the
email, the permissions of the user who edited the bug were
taken into account instead of the permissions of the
addressee. This means that confidential information could
be disclosed to the addressee if the other user has more
privileges than the addressee.
Plain text bugmails are not affected as bug and attachment
IDs are not linkified.
Information Leak
Versions: 2.17.5 to 3.6.9, 3.7.1 to 4.0.6, 4.1.1 to
4.2.1, 4.3.1
The description of a private attachment could be visible
to a user who hasn’t permissions to access this attachment
if the attachment ID is mentioned in a public comment in
a bug that the user can see.