Server-side request forgery in the OAuth2 discovery handling in Loom for AWS before 1.7.0 might allow an authenticated remote user to obtain the access token of another user of the deployment and to cause the application to issue requests to arbitrary internal network locations, via a crafted discovery document address supplied when registering a tool server or remote agent configured for delegated authentication.



To remediate this issue, users should upgrade to version 1.7.0 or later.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

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No data.

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No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-124-aws/ cve-icon cve-icon
https://github.com/awslabs/loom/releases/tag/v1.7.0 cve-icon cve-icon
https://github.com/awslabs/loom/security/advisories/GHSA-jcxf-gpf4-58hm cve-icon cve-icon
History

Fri, 02 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
References

Fri, 02 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Server-side request forgery in the OAuth2 discovery handling in Loom for AWS before 1.7.0 might allow an authenticated remote user to obtain the access token of another user of the deployment and to cause the application to issue requests to arbitrary internal network locations, via a crafted discovery document address supplied when registering a tool server or remote agent configured for delegated authentication. To remediate this issue, users should upgrade to version 1.7.0 or later.
Title Server-side request forgery in the OAuth2 discovery handling in Loom for AWS
Weaknesses CWE-201
CWE-918
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-10-02T19:16:02.590Z

Reserved: 2026-10-01T14:59:36.668Z

Link: CVE-2026-103957

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-02T19:16:39.893

Modified: 2026-10-02T20:17:00.390

Link: CVE-2026-103957

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T21:00:18Z

Weaknesses