EUVD-2026-71692Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
PR:H for cluster-scoped PV creation rights; S:C because impact crosses from Kubernetes into EFS; C:N as no data is read, only deleted.
Primary rating from Vendor (AMZN).
CVSS VectorVendor: AMZN
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Unverified access-point ownership in the AWS EFS CSI Driver before v3.4.1 enables an authenticated Kubernetes user holding PersistentVolume creation privileges to trigger recursive deletion of directory trees on EFS filesystems they are not authorized to access. The volume deletion component accepts a crafted volumeHandle that cross-pairs an access point from one EFS filesystem with a different target filesystem, and the driver never validates that the access point belongs to the stated filesystem before executing the deletion. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a Kubernetes user identity or service account with RBAC verbs create and delete on the cluster-scoped persistentvolumes resource - this permission is not granted by default to namespace-level users and is typically restricted to cluster administrators, storage operators, or highly privileged CI/CD service accounts. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-provided CVSS 4.0 score is 5.1 (Medium) with vector AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade the AWS EFS CSI Driver to v3.4.1, which resolves the ownership-verification flaw in the volume deletion path; the release is available at https://github.com/kubernetes-sigs/aws-efs-csi-driver/releases/tag/v3.4.1 with the full advisory at https://aws.amazon.com/security/security-bulletins/2026-099-aws/. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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