CVE-2026-85781Network attack vector

Recursive directory deletion via mismatched volume handles

Published Sep 4, 2026 · Updated Sep 4, 2026

Unverified ownership in the volume-deletion path of Amazon EFS CSI Driver 3.4.0 and earlier allows remote authenticated users to delete EFS data. The controller resolves the access point's root path, mounts the file system named in the crafted handle, and recursively deletes that path without confirming common ownership. Exploitation requires the non-default deletion option, PersistentVolume influence with a Delete reclaim policy, and controller access to the target; it destroys data without disclosing it.

CVSS severity5.1
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unverified ownership in the volume-deletion path of Amazon EFS CSI Driver 3.4.0 and earlier allows remote authenticated users to delete EFS data. The controller resolves the access point's root path, mounts the file system named in the crafted handle, and recursively deletes that path without confirming common ownership. Exploitation requires the non-default deletion option, PersistentVolume influence with a Delete reclaim policy, and controller access to the target; it destroys data without disclosing it.

The record

CVE
CVE-2026-85781
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Amazon Web Services
Product
Amazon EFS CSI Driver
Classifications
CWE-283, CAPEC-122, T1485
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Amazon Web Services · Amazon EFS CSI Driverversion=0 <=3.4.0

Published CVSS scores

5.1Amazon Web Services CNACVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H
8.7Amazon Web Services CNACVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-283Unverified Ownership
CAPEC-122Privilege Abuse
T1485Data Destruction

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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