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

- 種別: advisory
- 関連技術: elasticsearch
- 公開日時: 2026-10-06T18:53:21.000Z
- 情報源: Elastic Security Announcements (https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-199/390874)
- パーマリンク: https://vulnpulse.app/items/elastic-security-dcb8f4962fd6

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…