CVE-2026-48778

Description

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <GUIConfig name="commandLineInterpreter"> tag in config.xml is read by NppXml::value() (Parameters.cpp:6430) and stored in _nppGUI._commandLineInterpreter without any validation, whitelist, or digital signature check. When the user triggers IDM_FILE_OPEN_CMD (File → Open Containing Folder → cmd), NppCommands.cpp:228 creates a Command object with this value and calls run(), which invokes ShellExecute (RunDlg.cpp:221) with the attacker-controlled string as the executable path. This vulnerability is fixed in 8.9.6.1.

CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0131

Probability of exploitation

0.67%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-78 OS Command Injection

Affected Products

Vendor	Product	Versions
notepad-plus-plus	notepad\+\+	< 8.9.6.1

References

Advisories & Patches

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/24c7b5c63cece76dbc8c4f2607a27ebfe22fa614 https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-7hm3-wp5q-ccv9 https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-7hm3-wp5q-ccv9

Exploits

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-7hm3-wp5q-ccv9 https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-7hm3-wp5q-ccv9

Frequently Asked Questions

What is CVE-2026-48778? +

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <GUIConfig name="commandLineInterpreter"> tag in config.xml is read by NppXml::value() (Parameters.cpp:6430) and stored in _nppGUI._commandLineInterpreter without any validation, whitelist, or digital signature check. When the user triggers IDM_FILE_OPEN_CMD (File → Open Containing Folder → cmd), NppCommands.cpp:228 creates a Command object with this value and calls run(), which invokes ShellExecute (RunDlg.cpp:221) with the attacker-controlled string as the executable path. This vulnerability is fixed in 8.9.6.1. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-48778? +

CVE-2026-48778 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0131, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-48778? +

CVE-2026-48778 affects products from notepad-plus-plus, specifically: notepad\+\+. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-48778? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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