CVE-2026-44257Public exploitNetwork attack vector

Remote code execution via unchecked ZIP entry paths

Published May 12, 2026 · Updated May 12, 2026

Path traversal in EFW Framework before 4.08.010 allows remote attackers to execute commands by uploading a crafted ZIP archive. FileManager.unZip joins each untrusted ZIP entry name directly to baseDir without verifying that the canonical output path remains inside that directory. Exploitation requires an exposed upload flow and an application event that invokes saveUploadFiles and unZip; a JSP written into the servlet context executes as the Tomcat user.

CVSS severity9.3
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in EFW Framework before 4.08.010 allows remote attackers to execute commands by uploading a crafted ZIP archive. FileManager.unZip joins each untrusted ZIP entry name directly to baseDir without verifying that the canonical output path remains inside that directory. Exploitation requires an exposed upload flow and an application event that invokes saveUploadFiles and unZip; a JSP written into the servlet context executes as the Tomcat user.

The record

CVE
CVE-2026-44257
Published
May 12, 2026
Updated
May 12, 2026
Vendor
ESCCO Japan Co., Ltd.
Product
EFW Framework
Classifications
CWE-77, T1190, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=< 4.08.010

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ESCCO Japan Co., Ltd. · EFW Frameworkversion=< 4.08.010

Published CVSS scores

9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application
T1505.003Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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