CVE-2026-77806

Introduction Content Management Systems (CMS) form the backbone of millions of web applications worldwide. When a critical vulnerability surfaces within a core CMS framework, the potential blast radius is immense. CVE-2026-77806 represents one such severe threat—a critical, unauthenticated Remote Code Execution (RCE) flaw affecting the SPIP publishing framework in versions prior to 4.4.21. Achieving a CVSS score of 9.8 (Critical), this vulnerability allows unauthenticated remote attackers to