CVE-2025-56383 (CVSS 8.4)

Description

Notepad++ v8.8.3 has a DLL hijacking vulnerability, which can replace the original DLL file to execute malicious code. NOTE: this is disputed by multiple parties because the behavior only occurs when a user installs the product into a directory tree that allows write access by arbitrary unprivileged users.

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CVSS v3.1 Score

8.4

HIGH

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

Weakness Type (CWE)

CWE-427 CWE-427

References

Other References

https://github.com/notepad-plus-plus/notepad-plus-plus https://github.com/zer0t0/CVE-2025-56383-Proof-of-Concept https://github.com/zer0t0/CVE-2025-56383-Proof-of-Concept/issues/1 https://www.vicarius.io/vsociety/posts/cve-2025-56383-detect-notepad-vulnerability https://www.vicarius.io/vsociety/posts/cve-2025-56383-mitigate-notepad-vulnerability

Frequently Asked Questions

What is CVE-2025-56383? +

Notepad++ v8.8.3 has a DLL hijacking vulnerability, which can replace the original DLL file to execute malicious code. NOTE: this is disputed by multiple parties because the behavior only occurs when a user installs the product into a directory tree that allows write access by arbitrary unprivileged users. It has a CVSS v3.1 base score of 8.4 (HIGH).

How severe is CVE-2025-56383? +

CVE-2025-56383 has a CVSS v3.1 score of 8.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-56383? +

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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