CVE-2026-85288

Description

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ incompletely enforces shortcuts.xml HMAC validation because WM_MACRODLGRUNMACRO, the Run a Macro Multiple Times entry point, calls macroPlayback() without the validation used by command(). A tampered shortcuts.xml macro that is blocked through the Macro menu or a shortcut key can therefore execute through the multi-run dialog and invoke internal Notepad++ commands, including commands that launch external programs, in the current user context. This issue is fixed in version 8.9.8.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 6.7 / 10
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Effective score: 6.7 / 10 MEDIUM source: CNA overview
CWE(s): CWE-78, CWE-345, CWE-693
Reserved: 2026-09-03
Published: 2026-09-22 17:11 UTC
Last updated: 2026-09-22 17:11 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/85xxx/CVE-2026-85288.json

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: 2026-09-22 18:17:23 UTC
NVD last modified: 2026-09-22 18:17:23 UTC
NVD CVSS v3.1: 6.7 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore: 0.8 / 10
Impact subscore: 5.9 / 10

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-2026-84571
Assigner: GitHub_M
Published: Sep 22, 2026, 5:11:47 PM
Updated: Sep 22, 2026, 5:11:47 PM
EUVD base score (CVSS 3.1): 6.7 / 10
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.0000
Vendors: notepad-plus-plus
Products: notepad-plus-plus (< 8.9.8)

ENISA description: Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ incompletely enforces shortcuts.xml HMAC validation because WM_MACRODLGRUNMACRO, the Run a Macro Multiple Times entry point, calls macroPlayback() without the validation used by command(). A tampered shortcuts.xml macro that is blocked through the Macro menu or a shortcut key can therefore execute through the multi-run dialog and invoke internal Notepad++ commands, including commands that launch external programs, in the current user context. This issue is fixed in version 8.9.8.

EUVD references (4)

Affected products (1)

Vendor	Product	Versions	Platforms
notepad-plus-plus	notepad-plus-plus	`< 8.9.8` (affected)	—

Vendor references (4)

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

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-759j-g8j4-867p x_refsource_CONFIRM
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/4cd74cb9347b9c6caaab17d999e24fc9ed228ff7 x_refsource_MISC
https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 x_refsource_MISC
https://notepad-plus-plus.org/news/v898-released x_refsource_MISC

Web references (0)

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

No web references attached yet.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/4cd74cb9347b9c6caaab17d999e24fc9ed228ff7 security-advisories@github.com
https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 security-advisories@github.com
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-759j-g8j4-867p security-advisories@github.com
https://notepad-plus-plus.org/news/v898-released security-advisories@github.com

Remediations (10)

Microsoft Patch Tuesday Security Recap: September 2026 Edition

web:arcticwolf.com

Microsoft's September 2026 Patch Tuesday addresses 974 vulnerabilities, including two actively exploited zero-days and more than 110 critical flaws affecting Windows, Exchange, SharePoint, SQL Server, and more.

2026-09-23 15:43 UTC
Security Advisories and Bulletins | Microsoft Learn

web:learn.microsoft.com

Learning path Learn how Microsoft supports secure software development as part of a cybersecurity solution - Training Secure software development means integrating security into each phase of your development lifecycle, from requirements analysis to maintenance. Microsoft provides many services that can help you develop more secure code and deploy a more secure application in the cloud. This ...

2026-09-23 15:43 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:43 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:43 UTC
July 18, 2026—Hotpatch KB5121768 (OS Builds 26200.8893 and 26100.8893 ...

web:support.microsoft.com

This out-of-band (OOB) update for Windows 11, version 25H2 and Windows 11, version 24H2 (KB5121768) is cumulative. It includes all improvements from previous security and non-security updates, along with an additional fix . Improvements This OOB update includes the following improvement: [System Performance] This update addresses an issue affecting a limited number of devices with an Intel ...

2026-09-23 15:43 UTC
August 2026 CVE Advisory Notification - Security

web:support.servicenow.com

Due to additional analysis provided by the security researcher who discovered CVE - 2026 -6876, we have upgraded the severity rating of CVE - 2026 -6876 from High to Critical. This change affects only the severity

2026-09-23 15:43 UTC
August's Patch Tuesday is a monster: 751 fixes, with an exploited ...

web:www.computerworld.com

August's Patch Tuesday is a big one: 751 fixes, an exploited WinSock flaw and plenty of critical Windows, Office and Exchange issues.

2026-09-23 15:43 UTC
CVE-2026-85288: notepad-plus-plus: Notepad++ is a free and ... - Rapid7

web:www.rapid7.com

CVE-2026-85288 : notepad-plus-plus: Notepad++ is a free and open-source source code editor. View severity, references, and remediation details from Rapid7.

2026-09-23 15:43 UTC
September 2026 Microsoft Patch Tuesday | Tenable®

web:www.tenable.com

Microsoft patched 964 CVEs in September, the most ever in a Patch Tuesday release in its history, including two zero-day vulnerabilities exploited in the wild.

2026-09-23 15:43 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

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

2026-09-23 15:43 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-85288.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "notepad-plus-plus",
          "vendor": "notepad-plus-plus",
          "versions": [
            {
              "status": "affected",
              "version": "< 8.9.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ incompletely enforces shortcuts.xml HMAC validation because WM_MACRODLGRUNMACRO, the Run a Macro Multiple Times entry point, calls macroPlayback() without the validation used by command(). A tampered shortcuts.xml macro that is blocked through the Macro menu or a shortcut key can therefore execute through the multi-run dialog and invoke internal Notepad++ commands, including commands that launch external programs, in the current user context. This issue is fixed in version 8.9.8."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-78",
              "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-693",
              "description": "CWE-693: Protection Mechanism Failure",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T17:11:47.937Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-759j-g8j4-867p",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-759j-g8j4-867p"
        },
        {
          "name": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/4cd74cb9347b9c6caaab17d999e24fc9ed228ff7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/4cd74cb9347b9c6caaab17d999e24fc9ed228ff7"
        },
        {
          "name": "https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8"
        },
        {
          "name": "https://notepad-plus-plus.org/news/v898-released",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://notepad-plus-plus.org/news/v898-released"
        }
      ],
      "source": {
        "advisory": "GHSA-759j-g8j4-867p",
        "discovery": "UNKNOWN"
      },
      "title": "Notepad++: Shortcuts.xml macro HMAC bypass still reachable via the \"Run a Macro Multiple Times\" dialog"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-85288",
    "datePublished": "2026-09-22T17:11:47.937Z",
    "dateReserved": "2026-09-03T16:37:49.262Z",
    "dateUpdated": "2026-09-22T17:11:47.937Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}