CVE-2026-7461
OS Command Injection in Amazon ECS Agent via FSx Windows File Server Volume Credentials
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
OS Command Injection in Amazon ECS Agent via FSx Windows File Server Volume Credentials
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.
- Record
CVE-2026-7461- CVSS 4.0
- 7.5 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
EUVDEUVD-2026-26412
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.
- Record
EUVD-2026-26412- CVSS 4.0
- 7.5 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fc67-c4hg-q653
Amazon ECS Container Agent (Windows) is vulnerable to Information Disclosure
Summary
Amazon Elastic Container Service (Amazon ECS) 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 to the latest Amazon ECS-optimized Windows AMI with an updated ECS agent version.
Workarounds
Customers who cannot update to the latest AMI can restrict ecs:RegisterTaskDefinition permissions to trusted IAM principals only and restrict write access to Secrets Manager secrets referenced in FSx volume configurations.
References
If you have any questions or comments about this advisory, Amazon ECS asks that users contact [AWS/Amazon] Security via vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue.
Acknowledgement
Amazon ECS would like to thank Sachin Patil for collaborating on this issue through the coordinated vulnerability disclosure process.
- Record
GHSA-fc67-c4hg-q653- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-w2r9-8jfw-7fpr
Improper neutralization of inputs used in an OS command in the FSx Windows File Server volume...
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.
- Record
GHSA-w2r9-8jfw-7fpr- CVSS 4.0
- 7.5 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-7461- CVSS 4.0
- 7.5 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
OSV
OS Command Injection in Amazon ECS Agent via FSx Windows File Server Volume Credentials
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.
- Record
CVE-2026-7461- CVSS 4.0
- 7.5 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-78
- Updated
- 2026-11-02
OSVGHSA-fc67-c4hg-q653
Amazon ECS Container Agent (Windows) is vulnerable to Information Disclosure
Summary
Amazon Elastic Container Service (Amazon ECS) 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 to the latest Amazon ECS-optimized Windows AMI with an updated ECS agent version.
Workarounds
Customers who cannot update to the latest AMI can restrict ecs:RegisterTaskDefinition permissions to trusted IAM principals only and restrict write access to Secrets Manager secrets referenced in FSx volume configurations.
References
If you have any questions or comments about this advisory, Amazon ECS asks that users contact [AWS/Amazon] Security via vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue.
Acknowledgement
Amazon ECS would like to thank Sachin Patil for collaborating on this issue through the coordinated vulnerability disclosure process.
- Record
GHSA-fc67-c4hg-q653- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-78
- Updated
- 2026-11-02
OSVGO-2026-5353 No score
Amazon ECS Container Agent (Windows) is vulnerable to Information Disclosure in github.com/aws/amazon-ecs-agent
Amazon ECS Container Agent (Windows) is vulnerable to Information Disclosure in github.com/aws/amazon-ecs-agent
- Record
GO-2026-5353- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/aws/amazon-ecs-agentGo |
1.47.0 to 1.102.2 | 1.103.0 |
github.com/aws/amazon-ecs-agentGo |
1.47.0 up to 1.103.0 | 1.103.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-7461 is a high vulnerability (CVSS 7.5) in Aws Amazon Ecs Agent, published April 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 45th percentile. Fixed in github.com/aws/amazon-ecs-agent 1.103.0.
References
github.com/aws/amazon-ecs-agent/releases/tag/v1.103.0
aws.amazon.com/security/security-bulletins/2026-024-aws
nvd.nist.gov/vuln/detail/CVE-2026-7461