CVE-2026-52886: Notepad-Plus-Plus

Medium severity, CVSS 5.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, Notepad++ validates the backupFilePath attribute from session.xml with std::wstring::starts_with against the expected backup directory without path normalization, allowing parent-directory sequences during snapshot-mode restoration to read an arbitrary user-readable file outside the backup directory into an editor tab. This issue is fixed in version 8.9.7.

Affected products

• Notepad-Plus-Plus Notepad-Plus-Plus: before 8.9.7 (fixed in 8.9.7)

Published 2026-08-17. Last modified 2026-09-09.