AWS Security Agent MCP Server S3 Bucket Ownership Verification Missing

A missing S3 bucket ownership verification in the AWS Security Agent MCP server before version 0.2.0 allows remote attackers to obtain private source archives including credentials and infrastructure state via pre-registered storage buckets derived from publicly known account identifiers.

Disclosed 10 September 2026 · Record updated 1 October 2026

Impact

Remote attackers could access private source archives containing credentials and infrastructure state of scanned workspaces through pre-registered S3 buckets.

Our coverage

A lock-picker slips past an unguarded gate, plants fake mailboxes in a warehouse, then intercepts packages containing blueprints and keys meant for the owner.

Vulnerabilities

AWS patches S3 bucket flaw in Security Agent MCP server

A missing ownership check let attackers pre-register scan output buckets and collect private source archives, credentials and infrastructure state.

14 Sept 2026

Sources

nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-87913