CVE-2026-48800

Description

Notepad++ allows arbitrary code execution via the Command tag inside UserDefinedCommands in shortcuts.xml. The tag content is passed to ShellExecute without validation when the user clicks the corresponding Run menu entry.

Overview

State

—

Assigner (CNA)

—

CVSS severity

MEDIUM

CVSS score

5.0 / 10

CVSS vector

AV:N/AC:M/Au:S/C:C/I:C/A:C

Effective score

5.0 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

2026-05-26 00:00 UTC

Last updated

—

Source

https://www.rapid7.com/db/vulnerabilities/notepad-plus-plus-cve-2026-48800/

Linked Threat

CVE-2026-48800 — CVE-2026-48800

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-06-26 21:16:34 UTC

NVD last modified

2026-06-30 05:19:35 UTC

NVD CVSS v3.1

7.8 / 10 HIGH source: security-advisories@github.com

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability subscore

1.8 / 10

Impact subscore

5.9 / 10

EPSS score

0.0036 (probability of exploitation in next 30 days)

EPSS percentile

28.72% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD-assigned CWE(s): CWE-78 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-39904

Assigner

GitHub_M

Published

Jun 26, 2026, 8:12:43 PM

Updated

Jun 30, 2026, 3:36:14 AM

EUVD base score (CVSS 3.1)

7.8 / 10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EUVD-reported EPSS

0.3600

Vendors

notepad-plus-plus

Products

notepad-plus-plus (< 8.9.6.1)

ENISA description: Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <Command> tag text content inside <UserDefinedCommands> in shortcuts.xml is read by NppXml::value(aNode) (Parameters.cpp:3658) in the feedUserCmds() function and stored in UserCommand._cmd without any validation. When the user clicks the corresponding entry in the Run menu, NppCommands.cpp:4264 creates a Command object with string2wstring(ucmd.getCmd()) and calls run(), which invokes ShellExecute (RunDlg.cpp:221) with the attacker-controlled string as the executable path. The injected command appears as a normal menu item in the Run menu, making it a viable persistence mechanism. This vulnerability is fixed in 8.9.6.1.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (5)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://nvd.nist.gov/vuln/detail/CVE-2026-48800 tenable:nvd.nist.gov
• https://attackerkb.com/topics/CVE-2026-48800 rapid7:attackerkb.com
• https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-3x3f-3j39-pj3v rapid7:github.com
• https://notepad-plus-plus.org/news/v8961-released/ rapid7:notepad-plus-plus.org
• https://www.cve.org/CVERecord?id=CVE-2026-48800 rapid7:www.cve.org

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

• Rapid7 — Solution
  rapid7

  notepadplusplus-upgrade

  2026-06-04 09:01 UTC
• Microsoft Confirms Defender RoguePlanet 0-Day Exploit and Working to ...
  web:cybersecuritynews.com

  Microsoft has officially acknowledged a critical zero-day vulnerability in Microsoft Defender, publicly dubbed "RoguePlanet," and confirmed it is actively developing a security patch to address the flaw.

  2026-06-19 02:34 UTC
• Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...
  web:cybersecuritynews.com

  Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...

  2026-06-19 02:34 UTC
• Nvd - Cve-2026-4800
  web:nvd.nist.gov

  NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

  2026-06-19 02:34 UTC
• Security Update Guide - Loading - Microsoft
  web:portal.msrc.microsoft.com

  The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

  2026-06-19 02:34 UTC
• March 13, 2026—Hotpatch KB5084597 (OS Builds 26200.7982 and 26100.7982 ...
  web:support.microsoft.com

  This update for Windows 11, version 25H2 and 24H2 (KB5084597) incudes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates. To view the ...

  2026-06-19 02:34 UTC
• February's Patch Tuesday release fixes 59 flaws ... - Computerworld
  web:www.computerworld.com

  Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...

  2026-06-19 02:34 UTC
• Microsoft is working on a patch for 'YellowKey ... - Computerworld
  web:www.computerworld.com

  Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...

  2026-06-19 02:34 UTC
• Microsoft working on a fix for RoguePlanet, a flaw that grants full PC ...
  web:www.malwarebytes.com

  Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.

  2026-06-19 02:34 UTC
• Patch Tuesday - June 2026 - Rapid7
  web:www.rapid7.com

  Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.

  2026-06-19 02:34 UTC
• Patch Tuesday June 2026: Security Updates & CVE Analysis
  web:zecurit.com

  Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

  2026-06-19 02:34 UTC

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