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OpenAdvisories
Medium · 5.9 CVE-2026-87913 EUVD-2026-75571

Missing S3 bucket ownership verification in the AWS Security Agent MCP server

Published Sep 10, 2026 · Updated Sep 10, 2026 · Assigned by AMZN

Description

A missing S3 bucket ownership verification in the AWS Security Agent MCP server before 0.2.0 version might allow remote attackers to obtain the private source archive of a scanned workspace, including credentials and infrastructure state contained in that archive, via a pre-registered storage bucket whose name is derived from a publicly known account identifier.

To remediate this issue, users should upgrade to version 0.2.0. Users should also verify that the scan output bucket in their account is owned by their own account, because upgrading does not release a bucket name that a third party has already registered.

Affected products

VendorProductAffectedFixed
AWS AWS Security Agent MCP server 0.1.0 – ≤ 0.1.5 —

References