# Notepad-plus-plus vulnerabilities & exploitation

**CISA KEV**

> As of 2026-10-05, Threadlinqs tracks 6 Notepad-plus-plus CVEs, 1 in the CISA Known Exploited Vulnerabilities catalog, linked to 1 tracked threat campaign.

**Data as of:** 2026-10-05

## Exploitation timeline

Threadlinqs has recorded 6 Notepad-plus-plus CVEs published between 2023-08-15 and 2026-08-15. The busiest month was 2026-02 (1 new CVE). 1 of them (17%) are listed in CISA KEV, which means exploitation in the wild has been confirmed.

## Most exploited vulnerabilities

Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 6 of 6 tracked Notepad-plus-plus CVEs.

- [CVE-2025-15556](https://intel.threadlinqs.com/cve/CVE-2025-15556) — HIGH 7.5 · KEV · EPSS 5.3% · 2026-02-03
- [CVE-2023-40031](https://intel.threadlinqs.com/cve/CVE-2023-40031) — HIGH 7.8 · EPSS 0.4% · 2023-08-25
- [CVE-2026-73250](https://intel.threadlinqs.com/cve/CVE-2026-73250) — MEDIUM 5.4 · EPSS 0.1% · 2026-08-11
- [CVE-2023-40164](https://intel.threadlinqs.com/cve/CVE-2023-40164) — MEDIUM 5.5 · EPSS 0.1% · 2023-08-25
- [CVE-2023-40166](https://intel.threadlinqs.com/cve/CVE-2023-40166) — MEDIUM 5.5 · EPSS 0.1% · 2023-08-25
- [CVE-2023-40036](https://intel.threadlinqs.com/cve/CVE-2023-40036) — MEDIUM 5.5 · EPSS 0% · 2023-08-25

## Products affected

Threadlinqs normalises CPE and CNA product records across all 6 CVEs; 2 distinct Notepad-plus-plus products are affected. The most frequently affected:

- Notepad++ — 5 CVEs
- notepad-plus-plus — 1 CVE

## Threat activity

1 tracked threat campaign reference Notepad-plus-plus products or exploit Notepad-plus-plus CVEs:

- [Lotus Blossom APT Supply Chain Compromise of Notepad++ Update Infrastructure (CVE-2025-15556)](https://intel.threadlinqs.com/threat/TL-2026-0214) — CRITICAL — 2026-03-12

## How to prioritise Notepad-plus-plus patching

This order follows the data Threadlinqs holds for Notepad-plus-plus, not a generic severity checklist:

- 1 of 6 Notepad-plus-plus CVEs (17%) are in CISA KEV: treat them as actively exploited and remediate them first, starting with [CVE-2025-15556](https://intel.threadlinqs.com/cve/CVE-2025-15556).
- Outside KEV, the highest EPSS scores are [CVE-2023-40031](https://intel.threadlinqs.com/cve/CVE-2023-40031) (0.4%), [CVE-2026-73250](https://intel.threadlinqs.com/cve/CVE-2026-73250) (0.1%), [CVE-2023-40164](https://intel.threadlinqs.com/cve/CVE-2023-40164) (0.1%).
- 0 CVEs score Critical and 2 High on CVSS v3 (maximum 7.8, average 6.2); sequence these after KEV and high-EPSS items.

## About this data

Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.

Canonical: https://intel.threadlinqs.com/vendors/notepad-plus-plus
All vendors: https://intel.threadlinqs.com/vendors
Full detection coverage and IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp