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

Quick assessment

Affected
AWS loom
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS Loom 1.7.0 之前的版本中，OAuth2 发现处理存在服务端请求伪造（SSRF）漏洞。攻击者通过构造恶意的发现文档地址（在注册工具服务器或配置为委派认证的远程代理时提供），可能使经过身份验证的远程用户获取部署中其他用户的访问令牌，并导致应用程序向任意内部网络位置发起请求。 要修复此问题，用户应升级至 1.7.0 或更高版本。

CVSS 6.2 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS loom < 1.7.0 affected
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I. Basic Information for CVE-2026-103957

Vulnerability Information
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Vulnerability Title
Server-side request forgery in the OAuth2 discovery handling in Loom for AWS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS loom 0 ~ 1.7.0 -

II. Public POCs for CVE-2026-103957

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III. Intelligence Information for CVE-2026-103957

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Vendor Advisories for CVE-2026-103957 (2)

Vendor Pages for CVE-2026-103957 (1)

Same Patch Batch · AWS · 2026-10-02 · 4 CVEs total

CVE-2026-103956 10.0 CRITICAL Missing authentication for critical function in Loom for AWS
CVE-2026-104019 9.0 CRITICAL OS command injection in the Studio Space startup validation script in Amazon SageMaker Dis
CVE-2026-103958 7.6 HIGH Server-side request forgery in the tool server and remote agent connection handling in Loo

IV. Related Vulnerabilities

Same product: loom
Same vendor: AWS
Same weakness: CWE-918

V. Comments for CVE-2026-103957

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