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Notepad++ < 8.9.4 Multiple Vulnerabilities

medium Nessus Plugin ID 311263

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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 8.9.4. It is, therefore, affected by multiple vulnerabilities:

 - A string injection vulnerability exists in the FindInFiles feature. When the nativeLang.xml file's 'find-result-hits' element contains a format string specifier such as '%s', successful exploitation could allow an attacker to obtain memory address information or crash the application. (CVE-2026-3008)

 - A vulnerability exists in the FindInFiles feature related to improper handling of format string specifiers in nativeLang.xml's 'find-result-hits' element. (CVE-2026-6539)

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 8.9.4 or later.

See Also

https://notepad-plus-plus.org/news/v894-released/

http://www.nessus.org/u?1cf60025

Plugin Details

Severity: Medium

ID: 311263

File Name: notepad_plus_plus_8_9_4.nasl

Version: 1.4

Type: Local

Agent: windows

Family: Windows

Published: 4/30/2026

Updated: 5/4/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Low

Base Score: 3.6

Temporal Score: 2.7

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

CVSS Score Source: CVE-2026-6539

CVSS v3

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 5.8

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

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

CVSS Score Source: CVE-2026-3008

CVSS v4

Risk Factor: Medium

Base Score: 4.6

Threat Score: 1

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/26/2026

Vulnerability Publication Date: 4/26/2026

Reference Information

CVE: CVE-2026-3008, CVE-2026-6539

IAVA: 2026-A-0410