CVE-2026-52763 YesWiki: SQL injection via the `recentchanges` action `period` argument leading to arbitrary DB read

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, the recentchanges action actions/recentchanges.php accepts a period argument from two disjoint parameter spaces. A whitelist validates only the URL form against 'day','week','month'. The action-argument form takes the else branch wi...