SB2026071473 - Multiple vulnerabilities in Notepad++

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026071473

SB2026071473 - Multiple vulnerabilities in Notepad++

Published: July 14, 2026

Security Bulletin ID SB2026071473
CSH Severity
High
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 20% Medium 60% Low 20%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Command injection (CVE-ID: N/A)

CWE-ID: CWE-77 - Command injection

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to command injection in the NSIS installer script when processing an attacker-controlled installation directory in a PowerShell -Command string. A remote user can supply an installation path containing PowerShell expansion syntax to execute arbitrary code.

Exploitation requires Windows 11, the x64 or ARM64 installer path that performs MSIX context menu registration, and selection of the context menu component.


2) Insufficient verification of data authenticity (CVE-ID: N/A)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to execute commands with elevated privileges.

The vulnerability exists due to insufficient verification of data authenticity in the shortcuts.xml macro processing path when loading an attacker-controlled shortcuts.xml through a settings directory consumed by an elevated Notepad++ instance. A local user can supply a crafted shortcuts.xml containing macros to execute commands with elevated privileges.

Exploitation is conditional on influencing the settings directory used by an elevated Notepad++ process and triggering the macro path.


3) Path traversal (CVE-ID: CVE-2026-57233)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to path traversal in WinGup decompress() plugin extraction routine when extracting a crafted plugin zip archive. A local user can supply a specially crafted archive with traversal sequences to execute arbitrary code.

Code execution occurs when Notepad++ later loads the overwritten plugin DLL.


4) Stack-based buffer overflow (CVE-ID: CVE-2026-54758)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to stack-based buffer overflow in expandNppEnvironmentStrs when parsing a variable name in the Run dialog input. A remote attacker can trick the victim into processing a specially crafted variable reference to cause a denial of service.

User interaction is required to open the Run dialog and submit crafted input.


5) Path traversal (CVE-ID: CVE-2026-52886)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to path traversal in the session.xml backupFilePath attribute validation when restoring a session file in snapshot mode. A local user can inject a crafted traversal path into session.xml to disclose sensitive information.

On the next application launch with snapshot mode active, the target file content is loaded into an editor tab after the operating system resolves parent-directory traversal sequences.


Remediation

Install update from vendor's website.

References