Vulnerability · Published Oct 2, 2026 · Assigned by AMZN

CVE-2026-103957Server-side request forgery in the OAuth2 discovery handling in Loom for AWS

Medium 6.2

In plain English

A medium-severity server-side request forgery in loom from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).

Severity (CVSS 3.1)6.2Medium

Exploit odds (30 days)0.4%top 65.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
AWS	loom	0 – before 1.7.0

Weakness: CWE-918, CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N

References

https://github.com/awslabs/loom/releases/tag/v1.7.0 release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-124-aws/ vendor-advisory
https://github.com/awslabs/loom/security/advisories/GHSA-jcxf-gpf4-58hm third-party-advisory