Vulnerability Description
Notepad++ is a free and open-source source code editor. Prior to 8.9.6.4, NppCommands.cpp checks the HMAC of the on-disk shortcuts.xml at the moment a user command fires (Time-of-Check). However, the command payload is taken from the in-memory _userCommands vector, which is populated at application startup and never re-synchronized with the on-disk file (Time-of-Use). Swapping shortcuts.xml between startup and command execution causes the HMAC check to validate a clean file while a malicious command runs. An attacker with write access to shortcuts.xml places a malicious version on disk before launch, then immediately restores the legitimate file. The HMAC check at execution time validates the restored legitimate file (check passes), while the malicious payload executes from memory. This vulnerability is fixed in 8.9.6.4.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Notepad-Plus-Plus | Notepad\+\+ | < 8.9.6.4 |
Related Weaknesses (CWE)
References
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/4f7563c7c7f8ffa0d7Patch
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-ExploitPatchVendor Advisory
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-ExploitPatchVendor Advisory
FAQ
What is CVE-2026-52885?
CVE-2026-52885 is a vulnerability with a CVSS score of 6.3 (MEDIUM). Notepad++ is a free and open-source source code editor. Prior to 8.9.6.4, NppCommands.cpp checks the HMAC of the on-disk shortcuts.xml at the moment a user command fires (Time-of-Check). However, the ...
How severe is CVE-2026-52885?
CVE-2026-52885 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52885?
Check the references section above for vendor advisories and patch information. Affected products include: Notepad-Plus-Plus Notepad\+\+.