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CVE-2026-87913

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

CVSS 3.1 5.9 MEDIUMCVSS 4.0 5.1 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-87913

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87913

Published

AWS Security Agent MCP server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "AWS",
                    "product": "AWS Security Agent MCP server",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.1.0",
                            "lessThanOrEqual": "0.1.5",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON