Permissive Cross-domain Policy with Untrusted Domains

Overview Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains in the SSE initialization handler due to the use of a hardcoded Access-Control-Allow-Origin: header. An attacker can gain unauthorized access to sensitive resources by exploiting DNS...

CVE-2026-9739

CVE-2026-9739 describes a DNS rebinding vulnerability due to a hardcoded Access-Control-Allow-Origin: * in the SSE initialization handler, despite earlier attempts to align with MCP security guidelines using allowed-origins and allowed-hosts. The issue specifically affects users connecting via To...