Detections
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Notepad++ < 8.9.7 Multiple Vulnerabilities

medium Nessus Plugin ID 327203

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Synopsis

A text editor on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Notepad++ installed on the remote host is prior to 8.9.7. It is, therefore, affected by multiple vulnerabilities:

 - A security bypass vulnerability exists in session.xml backupFilePath handling due to an incomplete starts_with check. An attacker could exploit this to bypass path validation controls. (CVE-2026-52886)

 - A stack buffer overflow vulnerability exists in the expandNppEnvironmentStrs function. An attacker could exploit this to execute arbitrary code. (CVE-2026-54758)

 - A zip slip (path traversal) vulnerability exists that allows an attacker to write files outside the intended directory when extracting archive contents. (CVE-2026-57233)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Notepad++ version 8.9.7 or later.

See Also

https://notepad-plus-plus.org/news/v897-slava-ukraini/

Plugin Details

Severity: Medium

ID: 327203

File Name: notepad_plus_plus_8_9_7.nasl

Version: 1.4

Type: Local

Agent: windows

Family: Windows

Published: 7/16/2026

Updated: 8/25/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.77

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:C

CVSS Score Source: CVE-2026-57233

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.1

Threat Score: 3.2

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-52886

Vulnerability Information

CPE: cpe:/a:notepad-plus-plus:notepad%5c%2b%5c%2b

Required KB Items: SMB/Registry/Enumerated, installed_sw/Notepad++

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/14/2026

Vulnerability Publication Date: 7/14/2026

Reference Information

CVE: CVE-2026-52886, CVE-2026-54758, CVE-2026-57233

IAVA: 2026-A-0706