CVE-2026-87913

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

Published: Sep 10, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-283

5.9MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-283 CWE-341

Affected Products

AWS

commercial·US

AWS Security Agent MCP serverMixed

Cloud & SaaS / cloud-platform

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://pypi.org/project/awslabs.security-agent-mcp-server/0.2.0/?refid=d8ec3b19-0f37-4f8c-8c12-189f913e205c

pypi.org

https://aws.amazon.com/security/security-bulletins/2026-105-aws/

aws.amazon.com

https://github.com/awslabs/mcp/security/advisories/GHSA-3jxw-vj8m-8x77

github.com

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