Amazon ECS Container Agent (Windows) is vulnerable to Information Disclosure
Date: 2026-05
Affected: go/github.com/aws/amazon-ecs-agent
Attack vector: command-injection
Category: vulnerability-disclosure
Severity: High
CWE: CWE-78
CVSS: 7.2 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)

### Summary [Amazon Elastic Container Service (Amazon ECS)](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/Welcome.html) is a fully managed container orchestration service that enables customers to deploy, manage, and scale containerized applications. An issue exists where, under certain circumstances, improper input validation in the FSx Windows File Server volume mounting process allows command injection through specially crafted credentials. ### Impact Improper neutralization of inputs used in an OS command in the FSx Windows File Server volume mounting component in Amazon ECS Agent on Windows before 1.103.0 might allow a remote authenticated threat actor to execute shell commands with SYSTEM privileges on the underlying host via a specially crafted username field in an ECS task definition. This issue requires permissions to register ECS task definitions or write to the Secrets Manager or SSM Parameter Store credentials used by the FSx volume configuration. To remediate this issue, users should upgrade to version 1.103.0. **Impacted versions**: Version 1.47.0 through 1.102.2 of the ECS Agent for Windows ### Patches This issue only impacts ECS Windows worker instances. ECS on Fargate is not affected. This issue has been addressed in ECS agent version 1.103.0. Amazon ECS recommends [upgrading](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/launch_window-container_instance.html) to the [latest](https://docs.aws.amazon.com/AmazonECS/latest/deve


Mitigations:

Architectural layers (MAESTRO):