CVE-2026-103956 Missing authentication for critical function in Loom for AWS
Remote attackers can gain super-admin control over the Loom agent control plane if no identity provider is configured, allowing credential theft and policy manipulation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103956?
CVE-2026-103956 is a critical missing authorization vulnerability in AWS loom, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing authentication for critical function in the authentication dependency in Loom for AWS before 1.6.1 allowed remote actors to obtain super-admin authority over the agent control plane, including registering tool servers, reading stored integration credentials, and rewriting the IAM role policies attached to managed agent roles, via any request to the application API in a deployment where no identity provider is configured.
To remediate this issue, users should upgrade to version 1.6.1 or later.
Which versions are affected by CVE-2026-103956?
How do I fix CVE-2026-103956?
No fix has been published for CVE-2026-103956 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-103956 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103956 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-vgmj-998f-r8mp.