What is CVE-2026-77605?

CVE-2026-77605 is a high-severity vulnerability in Notepad-Plus-Plus, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2026-09-22.

How severe is CVE-2026-77605?

High severity. CVSS v3 base score is 7.8 out of 10.

Improper input validation in Notepad-Plus-Plus

CVE-2026-77605

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-09-22.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Notepad-Plus-Plus — versions < 8.9.8

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-77605?: CVE-2026-77605 is a high-severity vulnerability in Notepad-Plus-Plus, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2026-09-22.
How severe is CVE-2026-77605?: High severity. CVSS v3 base score is 7.8 out of 10.