CVE-2026-103956

Critical

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.

SeverityCritical

CVSS10.0

Exploit probability—

Product

Aws Loom

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-306Missing authentication for critical function CWE-1188CWE-1188

How to fix

Update

AWS loom1.6.1 or later

Patches

github.com/awslabs/loom/releases/tag/v1.6.1

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-124-aws/

Affected products

Product	Affected versions	Fixed in
AWS loom	v < 1.6.1	1.6.1

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