Missing Authorization in Notepad++ - #VU151935
Published: September 24, 2026
Vulnerability identifier: #VU151935
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-862
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to modify arbitrary files with elevated privileges.
The vulnerability exists due to missing authorization in the wWinMain UAC command-line operation dispatch when processing #UAC-SAVE# and related command-line arguments. A local user can invoke Notepad++ with crafted UAC operation arguments and approve the UAC prompt to modify arbitrary files with elevated privileges.
The UAC prompt does not display the destination path.
Affected software
Notepad++
Remediation
Install security update from vendor's website.
Notepad++ - update to 8.9.8.1