Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://aws.amazon.com/security/security-bulletins/2026-124-aws/
- https://github.com/awslabs/loom/releases/tag/v1.6.1
- https://github.com/awslabs/loom/security/advisories/GHSA-vgmj-998f-r8mp
FAQ
What is CVE-2026-103956?
CVE-2026-103956 is a vulnerability with a CVSS score of 10.0 (CRITICAL). 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...
How severe is CVE-2026-103956?
CVE-2026-103956 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-103956?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.