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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/ea1508855e9c4528f6198ce9d345f13cb759ebf4	Patch
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-p58x-r3c9-x9p6	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:notepad-plus-plus:notepad\+\+:8.9.6.1:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-26 21:16

Updated : 2026-06-29 21:22

NVD link : CVE-2026-52884

Mitre link : CVE-2026-52884

CVE.ORG link : CVE-2026-52884

JSON object : View

Products Affected

notepad-plus-plus

notepad\+\+

CWE

CWE-42

Path Equivalence: 'filename.' (Trailing Dot)

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