What is CVE-2026-103957?

CVE-2026-103957 is a medium-severity vulnerability in AWS Loom, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.2/10. Published 2026-10-02.

How severe is CVE-2026-103957?

Medium severity. CVSS v3 base score is 6.2 out of 10.

SSRF in AWS Loom

CVE-2026-103957

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.

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

AWS Loom

Weakness classification (CWE)

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-103957?: CVE-2026-103957 is a medium-severity vulnerability in AWS Loom, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.2/10. Published 2026-10-02.
How severe is CVE-2026-103957?: Medium severity. CVSS v3 base score is 6.2 out of 10.