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Vulnerability record · CVE-2026-103956 · published 2 October 2026

CVE-2026-103956: Missing authentication for critical function vulnerability

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.

10.0 CVSS 4.0 Critical EPSS 0.47% · top 61.7% CWE-306 · Missing authentication for critical functionCWE-1188 · Insecure default initialization Received
10.0CVSS 4.0 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
2 Oct 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-103956), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.