CVE-2026-77605 Notepad++ - Command Injection

Notepad++ < 8.9.8 contains a command injection caused by improper resolution of sibling files in Folder as Workspace Run by system action, letting attackers execute arbitrary scripts as the current user, exploit requires user to invoke Run by system on a crafted file.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Command Injection
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to version 8.9.8 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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