CVE-2026-103956 PUBLISHED

Missing authentication for critical function in Loom for AWS

Assigner: AMZN
Reserved: 01.10.2026 Published: 02.10.2026 Updated: 02.10.2026

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 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 10

Product Status

Vendor AWS
Product loom
Versions Default: unaffected
  • affected from 0 to 1.6.1 (excl.)

References

Problem Types

  • CWE-306 Missing authentication for critical function CWE
  • CWE-1188 Initialization of a resource with an insecure default CWE

Impacts

  • CAPEC-115 Authentication Bypass