Input validation error in Notepad++ - #VU144986
Published: August 24, 2026
Vulnerability identifier: #VU144986
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper input validation in session file loading for FileBrowser root enumeration when processing a crafted .npp-session file containing a UNC path in the foldername attribute. A remote attacker can trick the victim into opening a crafted session file to disclose sensitive information.
Windows may automatically perform NTLM authentication to an attacker-controlled SMB server, and user interaction is required to load the crafted session file.
Affected software
Notepad++
Remediation
Install security update from vendor's website.
Notepad++ - update to 8.9.8