Elasticsearch 8.19.23, 9.4.8, 9.5.5 Security Update (ESA-2026-199)

Authorization Bypass Through User-Controlled Key in Elasticsearch Leading to Information Disclosure Authorization Bypass Through User-Controlled Key (CWE-639) in Elasticsearch can lead to Information Disclosure via a specially crafted cross-cluster search request that references an unauthorized shard identifier. Elasticsearch contains an authorization bypass weakness in its handling of cross-cluster search requests made through the Remote Cluster Security (RCS) 2.0 model. An authorization check validates a request against one identifying attribute of the target shard, while a separate, indepe…

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