CVE-2026-85781: CWE-283 Unverified ownership in aws aws-efs-csi-driver
Description
Unverified ownership of a storage access point in the volume deletion component of the Amazon EFS CSI Driver before v3.4.1 might allow an authenticated Kubernetes user with PersistentVolume creation privileges to cause recursive deletion of directories on an EFS filesystem they are not authorized to access, via a crafted PersistentVolume volumeHandle that pairs an access point from one filesystem with a different target filesystem. To remediate this issue, users should upgrade to version v3.4.1.
CVSS v4.0
Score 5.1medium
Affected software
aws
aws-efs-csi-driver
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-85781) affects the Amazon EFS CSI Driver prior to v3.4.1. It arises from improper verification of ownership of storage access points during volume deletion. An attacker with authenticated Kubernetes access and PersistentVolume creation rights can craft a volumeHandle that pairs an access point from one filesystem with a different target filesystem, enabling recursive deletion of directories on an unauthorized EFS filesystem. The vulnerability is tracked under CWE-283 (Unverified Ownership). AWS manages remediation for this cloud-hosted service and advises upgrading to version 3.4.1.
Potential Impact
An authenticated Kubernetes user with PersistentVolume creation privileges can cause recursive deletion of directories on an EFS filesystem they should not have access to. This could lead to unauthorized data deletion and potential disruption of services relying on the affected filesystem.
Mitigation Recommendations
AWS manages remediation for this cloud-hosted service. Users should upgrade the Amazon EFS CSI Driver to version 3.4.1 or later to address this vulnerability. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-099-aws/ for the latest guidance and confirmation of patch status.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-09-04T16:27:45.409Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-099-aws/","vendor":"AWS"}]
Threat ID: 6a9b1379acd9273b49121d82
Added to database: 09/04/2026, 18:52:41 UTC
Last enriched: 09/07/2026, 11:55:17 UTC
Last updated: 10/19/2026, 18:48:24 UTC
Views: 135
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