EUVD-2026-84573Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-delivery vector (AV:L) with required user interaction invoking 'Run by system' (UI:R); no attacker privileges on the target needed (PR:N); resulting command execution gives full C/I/A as the current user.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
7DescriptionCVE.org
Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd appended, and the user invokes Run by system on the text file on Windows 10 or Windows 11, Notepad++ can execute the sibling script as the current user instead of opening the selected file. This issue is fixed in version 8.9.8.
Articles & Coverage 1
AnalysisAI
Arbitrary code execution in Notepad++ prior to 8.9.8 on Windows 10 and Windows 11 occurs when the editor's 'Folder as Workspace' → 'Run by system' action resolves a sibling file instead of the path the user actually selected. If an attacker can place a script named after the selected text file with a .cmd extension appended (for example notes.txt.cmd next to notes.txt), invoking 'Run by system' on the text file causes that script to execute as the current user instead of opening the file. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of: the victim runs Notepad++ prior to 8.9.8 on Windows 10 or Windows 11; the attacker can place files into a folder the victim will open, specifically a malicious script named as the selected text file's path with `.cmd` appended (e.g., `notes.txt.cmd` beside `notes.txt`); the victim opens that folder via the 'Folder as Workspace' feature; and the victim explicitly invokes the 'Run by system' action on the text file. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS of 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects local code execution with full confidentiality, integrity, and availability impact under the current user's context. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Notepad++ 8.9.8 or later - vendor-released patch: 8.9.8 - which contains the fix in commit 00fa5df0da1d4f6b334317aa979db13ac77ee24d that canonicalizes the selected path with the \\?\ literal prefix and switches to ShellExecuteEx with SEE_MASK_FLAG_NO_UI; download from the release tag https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 and see the vendor notes at https://notepad-plus-plus.org/news/v898-released and advisory https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-w5xq-frjg-w4cw. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Notepad++ installations across Windows 10 and Windows 11 endpoints and confirm which hosts run versions earlier than 8.9.8, prioritizing developer, IT, and administrative workstations; where immediate upgrades are not possible, restrict or disable use of the 'Folder as Workspace' → 'Run by system' workflow and remind users not to open text files sourced from untrusted archives, downloads, or shared drives. …
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External POC / Exploit Code
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