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Fencer Intel
high 8.7

CVE-2026-85781 json

Unverified access point ownership in Amazon EFS CSI Driver

published 2mo ago modified 2mo ago also EUVD-2026-71692

cvss
8.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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.

Patch / fix

Is CVE-2026-85781 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-85781 updated cvss 7.7

github.com/kubernetes-sigs/aws-efs-csi-driver: Amazon EFS CSI Driver: Unauthorized directory deletion via unverified access point ownership

  • Red Hat OpenShift Container Platform 4 openshift4/ose-aws-efs-csi-driver-container-rhel8 Red Hat OpenShift Container Platform 5 openshift5/ose-aws-efs-csi-driver-container-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4.22 openshift4/ose-aws-efs-csi-driver-container-rhel9 1792770116
    fixed: vendor fix RHSA-2026:89199
  • Red Hat OpenShift Container Platform 4.22 openshift4/metallb-rhel9 1792771256, openshift4/ose-ptp-rhel9 1792771087, openshift4/sriov-cni-rhel9 1792770132, openshift4/pf-status-relay-rhel9 1792778964, openshift4/ptp-must-gather-rhel9 1792856554, openshift4/metallb-rhel9-operator 1792844438, +38 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 5.1 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
CNA 3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
CNA 4.0 5.1 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

Affected products

  • aws aws-efs-csi-driver

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.