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Vulnerability record · CVE-2026-48800 · published 26 June 2026

CVE-2026-48800: Notepad-plus-plus notepad\+\+ os command injection vulnerability

Notepad Plus Plus · Notepad\+\+

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.

7.8 CVSS 3.1 High EPSS 0.21% · top 90.0% CWE-78 · OS command injection
7.8CVSS 3.1 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
30 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/6b3dc52a9245c6d8c6287a8d6d93a30981c05feb Patch
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-3x3f-3j39-pj3v ExploitPatchVendor Advisory
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-3x3f-3j39-pj3v ExploitPatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-48800), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.