CVE-2026-86079: n8n: Path Injection in Elasticsearch and ElasticSecurity Nodes via Unencoded Identifiers

The Elasticsearch and ElasticSecurity nodes built REST endpoints by interpolating user-provided identifiers straight into the request path. A value containing path separators or dot segments changed which endpoint the request actually reached, so an operation intended for one document could hit another index or a cluster administration endpoint instead, under the stored Elasticsearch credential. The patch encodes each identifier as a single URL path segment and rejects values that normalise away.