CVE-2025-56383Public exploit

Local code execution via replaceable plugin DLL

Published Sep 26, 2025 · Updated Sep 26, 2025

DLL hijacking in Notepad++ 8.8.3 allows local users to execute code by replacing a plugin DLL in a writable installation. At launch, Notepad++ loads plugins\NppExport\NppExport.dll, so a same-named malicious replacement can run while forwarding the original exports. The claim is disputed because the default Program Files installation is not writable by unprivileged users; exposure requires a nondefault writable directory.

CVSS severity8.4
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL hijacking in Notepad++ 8.8.3 allows local users to execute code by replacing a plugin DLL in a writable installation. At launch, Notepad++ loads plugins\NppExport\NppExport.dll, so a same-named malicious replacement can run while forwarding the original exports. The claim is disputed because the default Program Files installation is not writable by unprivileged users; exposure requires a nondefault writable directory.

The record

CVE
CVE-2025-56383
Published
Sep 26, 2025
Updated
Sep 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.4CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.001Hijack Execution Flow: DLL

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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