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CVE-2026-103956 – Authentication Bypass / Super-Admin Takeover – Loom for AWS before 1.6.1

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Summary

CVE-2026-103956 is a critical missing-authentication vulnerability in Loom for AWS, an open-source AI agent orchestration platform maintained under AWS Labs. In deployments where no identity provider (IdP) is configured, the authentication dependency fails insecurely, allowing any unauthenticated network client to obtain super-admin authority over the entire agent control plane. The issue has been assigned a maximum CVSS v3.1 base score of 10.0 (Critical) and a CVSS v4.0 base score of 10.0 (Critical).

Technical details

  • Root cause: The application’s authentication dependency initializes with an insecure default (CWE-1188) — when no identity provider is configured for a deployment, the control-plane API enforces no authentication at all (CWE-306), rather than failing closed.
  • Trigger conditions: Any Loom for AWS deployment running a version prior to 1.6.1 that does not have an identity provider configured is exposed by default; no special configuration or prior access is required to trigger the flaw.
  • Attack vector: Network-based (AV:N) with low attack complexity, no privileges required, and no user interaction — exploitation is possible via any request to the application API.
  • Impact: A remote, unauthenticated actor can obtain full super-admin authority over the agent control plane, including:
    • Registering arbitrary tool servers into the orchestration environment
    • Reading stored integration credentials (e.g., OAuth2/OIDC secrets, API keys)
    • Rewriting IAM role policies attached to managed agent roles, enabling privilege escalation into connected AWS resources
  • The CVSS v3.1 vector indicates a Scope Change (S:C), reflecting that compromise of the vulnerable component can impact resources beyond its own security scope (e.g., downstream AWS IAM roles and credentials).

Affected software

  • Vendor: AWS (AWS Labs)
  • Product: Loom
  • Affected versions: All versions before 1.6.1 (version 0 up to, but not including, 1.6.1) deployed without an identity provider configured
  • Fixed version: 1.6.1 and later

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
  • CVSS v4.0 Base Score: 10.0 (Critical)
  • 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

Mitigation and recommended actions

  • Immediate: Upgrade Loom for AWS to version 1.6.1 or later, which requires explicit opt-in (via an environment variable) and loopback client validation for any local-development authentication bypass, and fails securely with HTTP 401 responses by default.
  • If immediate patching is not possible:
    • Ensure a proper identity provider (IdP) is configured for every Loom deployment — do not run deployments with no IdP configured, as this is the specific condition this vulnerability exploits.
    • Restrict network access to the Loom application API to trusted internal networks only (e.g., via security groups/firewalls) until the upgrade can be applied.
  • Post-upgrade hardening (recommended by the vendor for related issues disclosed alongside this CVE):
    • Rotate OAuth2/OIDC client secrets and any stored integration credentials.
    • Revoke and re-issue active access tokens.
    • Review AWS CloudTrail logs for unexpected IAM policy changes on managed agent roles, and rotate IAM role credentials if compromise is suspected.

References

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