Medium severity · published Oct 2, 2026
CVE-2026-103957
Server-side request forgery in the OAuth2 discovery handling in Loom for AWS
6.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LO
loom · AWS
before 1.7.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103957
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103957
release-notes
https://github.com/awslabs/loom/releases/tag/v1.7.0
vendor-advisory
https://aws.amazon.com/security/security-bulletins/2026-124-aws/
third-party-advisory
https://github.com/awslabs/loom/security/advisories/GHSA-jcxf-gpf4-58hm
More from loom
10.0
CVE-2026-103956
Missing authentication for critical function in Loom for AWS
7.6
CVE-2026-103958
Server-side request forgery in the tool server and remote agent connection handling in Loom for AWS
