Server-Side Request Forgery in Loom for AWS
CVE-2026-103957

8.2HIGH

Key Information:

Vendor

Aws

Status
Loom
Vendor
CVE Published:
2 October 2026

What is CVE-2026-103957?

A server-side request forgery vulnerability exists in Loom for AWS before version 1.7.0, allowing an authenticated remote user to exploit OAuth2 discovery handling. This could permit access to another user's access token, enabling requests to arbitrary internal network locations through a malicious discovery document supplied during tool server or remote agent registration for delegated authentication. Users are advised to upgrade to version 1.7.0 or later to mitigate this issue.

Affected Version(s)

loom 0 < 1.7.0

References

https://github.com/awslabs/loom/releases/tag/v1.7.0
release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-1...
vendor-advisory
https://github.com/awslabs/loom/security/advisories/GHSA-...
third-party-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.