CVE-2026-87912 and CVE-2026-87913: Missing S3 bucket ownership verification in the AWS Security Agent plugin for aws-agents-for-devsecops and MCP Server

Bulletin ID: 2026-105-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/10/2026 08:30 AM PDT Description: AWS Security Agent is a managed AWS service that provides AI-powered code security reviews, threat modeling, and penetration testing. We identified CVE-2026-87912, where a missing S3 bucket ownership verification in the AWS Security Agent plugin in Amazon aws-agents-for-devsecops before version 1.1.0 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. We identified CVE-2026-87913, where a missing S3 bucket ownership verification in the AWS Security Agent MCP server before 0.2.0 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. Impacted versions: - - >=0.1.0 AND
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