# CVE-2026-52884

## Summary

- **CVE ID:** CVE-2026-52884
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-42
- **Published:** Jun 26, 2026
- **Last Modified:** Jun 26, 2026

## Description

Notepad++ is a free and open-source source code editor. In v8.9.6.1, isInTrustedDirectory() does NOT canonicalize the path before checking. It uses a prefix-based check (PathIsPrefix() or equivalent) that matches paths starting with trusted directory strings. A path traversal using ..\..\ after a trusted directory prefix passes the check while resolving to an untrusted location. The CVE-2026-48800 patch adds isInTrustedDirectory() validation in Command::run() (RunDlg.cpp) before calling ShellExecute(). This function checks whether the resolved executable path is under a trusted directory.  This vulnerability is fixed in 8.9.6.2.

## Affected Products

- notepad-plus-plus — notepad-plus-plus (= 8.9.6.1)

## References

- [CNA](https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-p58x-r3c9-x9p6)
- [CNA](https://github.com/notepad-plus-plus/notepad-plus-plus/commit/ea1508855e9c4528f6198ce9d345f13cb759ebf4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._