Special:Linksearch should default to all protocols instead of just http. This quirk is documented in the default MediaWiki:Linksearch-text. As it stands, this allows linkspammers to evade scrutiny by placing https links.
Example query: Special:Linksearch/*.spam.example.com should pick up the link to https://spam.example.com/blah I placed in my personal sandbox, but I have to search Special:Linksearch/https://*.spam.example.com to pick up this link.
Version: unspecified
Severity: enhancement