Critical 10.0Published Oct 2, 2026

CVE-2026-103956Missing authentication for critical function in Loom for AWS

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects AWS loom. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.47%, higher than 39% of scored CVEs.

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Exploited in the last 30 days

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: 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-306, CWE-1188
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.47% (percentile 39)
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Oct 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS loom aws:loom (from the name)	before 1.6.1	CNA record

References

https://github.com/awslabs/loom/releases/tag/v1.6.1release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-124-aws/vendor-advisory
https://github.com/awslabs/loom/security/advisories/GHSA-vgmj-998f-r8mpthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.