CVE-2026-115413
Published:October 27, 2026
Updated:October 28, 2026
Missing token audience validation in the OAuth authentication mode of AWS API MCP Server before version 1.6.0 might allow local users to run AWS operations with the server's configured AWS credentials via an access token issued to another application by the same identity provider.
To remediate this issue, users should upgrade to version 1.6.0 and configure the expected token audience or client ID for the server.
Affected Packages
https://github.com/awslabs/mcp.git (GITHUB):
Affected version(s) >=2025.12.20251223100855 <2026.10.20261027104512Fix Suggestion:
Update to version 2026.10.20261027104512awslabs.aws-api-mcp-server (PYTHON):
Affected version(s) >=1.3.0 <1.6.0Fix Suggestion:
Update to version 1.6.0Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.3
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Origin Validation Error