Spip - Referer Spam - CRITICAL - CVE-2026-27743. The SPIP Referer Spam plugin, specifically versions prior to 1.3.0, is susceptible to an unauthenticated SQL injection vulnerability. This arises from the 'referer_spam_ajouter' and 'referer_spam_supprimer' action handlers, which directly incorporate user-supplied data from the URL parameter into SQL LIKE clauses without adequate input validation or parameterization. The lack of authorization checks and absence of SPIP's action protection mechanisms, such as securiser_action(), enable remote attackers to initiate arbitrary SQL queries, potentially compromising the integrity and security of the database.