Vulnerability Details CVE-2026-52884
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 4.3%
CVSS Severity
CVSS v3 Score 7.8
References
Products affected by CVE-2026-52884
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cpe:2.3:a:notepad-plus-plus:notepad++:8.9.6.1