by Kastro
Paper/Archive/CVE-2026-103956

CVE-2026-103956

AWS loom — Missing authentication for critical function in Loom for AWS

EPSS 2%CVSS 10.0
critical.is priorityof 100
47
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 84.6.846 × 2016.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
loom< 1.6.11.6.1CNA

Scores by source

AMZN (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
AMZN (CNA)10.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchgithub.com/awslabs/loom/releases/tag/v1.6.1advisoryaws.amazon.com/security/security-bulletins/2026-124-awswriteupgithub.com/awslabs/loom/security/advisories/GHSA-vgmj-998f-r8mp