OS command injection in the example SSM document provisioning script in Trusted Remote Execution (REX) before 2026-07-28 might allow an authenticated remote user who is permitted to invoke the Rex-RO or Rex-RW SSM document to execute arbitrary commands as root on the managed instance, bypassing Cedar policy enforcement. To remediate this issue, users should delete any Rex-RO and Rex-RW SSM documents created from the example script, in each account and Region where it was run.
History

Sat, 07 Nov 2026 07:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 06 Nov 2026 18:30:00 +0000


Fri, 06 Nov 2026 17:30:00 +0000


Fri, 06 Nov 2026 17:15:00 +0000

Type Values Removed Values Added
Description OS command injection in the example SSM document provisioning script in Trusted Remote Execution (REX) before 2026-07-28 might allow an authenticated remote user who is permitted to invoke the Rex-RO or Rex-RW SSM document to execute arbitrary commands as root on the managed instance, bypassing Cedar policy enforcement. To remediate this issue, users should delete any Rex-RO and Rex-RW SSM documents created from the example script, in each account and Region where it was run.
Title OS command injection in the example SSM documents in Trusted Remote Execution (REX)
First Time appeared Aws
Aws trusted-remote-execution
Weaknesses CWE-78
CPEs cpe:2.3:a:aws:trusted-remote-execution:n_a:*:*:*:*:*:*:*
Vendors & Products Aws
Aws trusted-remote-execution
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published: 2026-11-06T17:09:11.852Z

Updated: 2026-11-06T20:35:22.445Z

Reserved: 2026-11-04T19:50:42.531Z

Link: CVE-2026-122193

cve-icon Vulnrichment

Updated: 2026-11-06T20:35:04.451Z

cve-icon NVD

Status : Received

Published: 2026-11-06T17:17:20.313

Modified: 2026-11-06T21:17:07.030

Link: CVE-2026-122193

cve-icon Redhat

No data.