CVE-2026-49211: symfony/ux-autocomplete: Information exposure via unescaped LIKE wildcards in EntitySearchUtil

Symfony\UX\Autocomplete\Doctrine\EntitySearchUtil::addSearchClause() builds the LIKE expression used by the autocomplete endpoint by wrapping the client-supplied query in %...% without escaping the SQL LIKE wildcards (%, _, \). The value is passed as a bound parameter, so this is not SQL injection, but a client can send % to match every row or use _ as a single-character wildcard.

Because searchable_fields defaults to every property of the entity and the autocomplete endpoint is public by default (BaseEntityAutocompleteType ships with security => false), an unauthenticated user can turn the endpoint into a broad matcher or a blind boolean oracle against every column of the entity, including columns the application never intended to expose.