CVE-2026-115413 - AWS API MCP Server OAuth token audience validation bypass
CVE-2026-115413
Summary
Bulletin ID: 2026-099-AWS
Scope: AWS
Content Type: Important (requires attention)
Publication Date: 09/04/2026 11:45 AM PDT
Description:
The Amazon EFS CSI Driver is an open-source Kubernetes Container Storage Interface (CSI) driver that lets Kubernetes workloads use Amazon EFS file systems. We identified CVE-2026-85781, an issue in the driver's volume-deletion logic.
When the controller is configured with the non-default --delete-access-point-root-dir=true option, it did not verify that the EFS access point referenced by a PersistentVolume's volume handle belonged to the file system referenced by that same volume handle.
An authenticated Kubernetes user with permission to create PersistentVolumes could use a crafted volume handle to cause the controller to recursively delete directories from an Amazon EFS file system that the user was not otherwise authorized to modify. This issue does not affect Amazon EFS itself; Amazon EFS access controls operated as designed.
Impacted versions: <=3.4.0
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Products covered
A separate affected-products list was not included in the collected bulletin.
Remediation
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CVEs in this advisory 1
Update history
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