CVE-2026-44258Public exploitNetwork attack vector

Remote code execution via unchecked destination path

Published May 12, 2026 · Updated May 12, 2026

Path traversal in ESCCO EFW before 4.08.010 allows remote attackers to place files outside the configured home directory. elfinder_checkRisk omits the base64-encoded dst parameter used by elfinder_paste, which decodes and concatenates that destination before file.duplicate writes the chosen source file. Unauthenticated network access to efwServlet is sufficient to move a staged JSP into the webapp root and execute code with the application account.

CVSS severity9.3
Critical
EPSS probability0.29%
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 ESCCO EFW before 4.08.010 allows remote attackers to place files outside the configured home directory. elfinder_checkRisk omits the base64-encoded dst parameter used by elfinder_paste, which decodes and concatenates that destination before file.duplicate writes the chosen source file. Unauthenticated network access to efwServlet is sufficient to move a staged JSP into the webapp root and execute code with the application account.

The record

CVE
CVE-2026-44258
Published
May 12, 2026
Updated
May 12, 2026
Vendor
ESCCO Japan Co., Ltd.
Product
EFW
Classifications
CWE-78, T1190
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. · EFWversion=< 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.

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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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

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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