CVE-2026-103956 AWS CVE debrief

Who should care

AWS users and administrators who have Loom for AWS deployed in their environment should assess their exposure and upgrade to version 1.6.1 or later to remediate the vulnerability. Security teams and vulnerability management teams should review the vulnerability details and plan for remediation, including verifying authentication mechanisms and reviewing IAM role policies.

Why it matters

CVE-2026-103956 is a critical vulnerability in Loom for AWS that allows remote actors to obtain super-admin authority due to missing authentication. AWS users and administrators should assess their exposure and upgrade to version 1.6.1 or later to remediate.

• Potential unauthorized access to Loom for AWS deployments
• Possible elevation of privileges to super-admin authority
• Risk of unauthorized registration of tool servers and reading of stored integration credentials
• Need for verification of authentication mechanisms and IAM role policies

Technical summary

CVE-2026-103956 is a critical vulnerability in Loom for AWS before version 1.6.1. The vulnerability allows remote actors to obtain super-admin authority over the agent control plane due to missing authentication for a critical function. This can lead to unauthorized access and control of the Loom for AWS deployment, including registering tool servers, reading stored integration credentials, and rewriting IAM role policies attached to managed agent roles. The vulnerability is addressed in version 1.6.1 or later, and users should upgrade to remediate.

Defensive priority

High

Recommended defensive actions

• Upgrade Loom for AWS to version 1.6.1 or later
• Review and update IAM role policies attached to managed agent roles
• Verify authentication mechanisms for Loom for AWS deployments
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

Official CVE Program record and NIST NVD detail page confirm missing authentication in Loom for AWS before 1.6.1. Vendor advisory and release notes provide remediation guidance. Evidence is limited to public CVE details and vendor advisories; defenders should verify Loom for AWS deployments and assess exposure based on available information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.