CVE-2026-77605CWE-20CWE-706

CVE-2026-77605

High · published September 22, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
11.1
In the wild
Unconfirmed
What it is

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd appended, and the user invokes Run by system on the text file on Windows 10 or Windows 11, Notepad++ can execute the sibling script as the current user instead of opening the selected file. This issue is fixed in version 8.9.8.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00213 · 11.1th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-706 · Use of Incorrectly-Resolved Name or Reference
Published
2026-09-22T22:17Z
References (5)
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/00fa5df0da1d4f6b334317aa979db13ac77ee24d · [email protected]https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 · [email protected]https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-w5xq-frjg-w4cw · [email protected]https://notepad-plus-plus.org/news/v898-released · [email protected]https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-w5xq-frjg-w4cw · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 24 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 22 SEP 17:13Z
    Notepad++ “Run by system” executes *.txt.cmd when user selected *.txt (target confusion → command execution)
    cvelistv5