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CVE-2026-87913
Published:September 10, 2026
Updated:October 13, 2026
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 Packages
https://github.com/awslabs/mcp.git (GITHUB):
Affected version(s) >=2026.06.20260602223738 <2026.08.20260826125954
Fix Suggestion:
Update to version 2026.08.20260826125954
awslabs.security-agent-mcp-server (PYTHON):
Affected version(s) >=0.1.0 <0.2.0
Fix Suggestion:
Update to version 0.2.0
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CVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Unverified Ownership
Predictable from Observable State
EPSS
Base Score:
0.44