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CVE-2026-103956 Details

Description

Missing authentication for critical function in the authentication dependency in Loom for AWS before 1.6.1 allowed remote actors to obtain super-admin authority over the agent control plane, including registering tool servers, reading stored integration credentials, and rewriting the IAM role policies attached to managed agent roles, via any request to the application API in a deployment where no identity provider is configured. To remediate this issue, users should upgrade to version 1.6.1 or later.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: AMZNCVSS-B:10 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-124-aws/	AMZN
https://github.com/awslabs/loom/releases/tag/v1.6.1	AMZN
https://github.com/awslabs/loom/security/advisories/GHSA-vgmj-998f-r8mp	AMZN

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1188	Initialization of a Resource with an Insecure Default	AMZN
CWE-306	Missing Authentication for Critical Function	AMZN

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 2, 2026	CVE Modified	CISA-ADP
Oct 2, 2026	CVE Modified	AMZN
Oct 2, 2026	New CVE Received	AMZN