What are possible alternatives for Admin:Hover, which suffers a major security issue?
There are several other modules that do this (quotes are from the project pages of these modules, where available):

Contextual Links (Backport of contextual.module in Drupal 7):

Hover over nodes, blocks, and views blocks to expose styled edit/configure/delete tabs.


Admin links

Block edit

... provides inline (on mouseover) editing capability for any block or node.


Administer Tooltip

... adds little icons to all entities (node, block, view, user) which are visible on mouseover ...