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Vulnerability record · CVE-2026-85995 · published 22 September 2026

CVE-2026-85995: Improper verification of cryptographic signature vulnerability

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace or plant the updater-related file can cause Notepad++ to launch attacker-modified code when a user triggers the updater path, but the issue does not provide remote code execution by itself. This issue is fixed in version 8.9.8.

7.3 CVSS 3.1 High EPSS 0.12% · top 98.1% CWE-347 · Improper verification of cryptographic signature Awaiting Analysis
7.3CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Sep 2026Last modified by NVD

Description

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace or plant the updater-related file can cause Notepad++ to launch attacker-modified code when a user triggers the updater path, but the issue does not provide remote code execution by itself. This issue is fixed in version 8.9.8.

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

References

LinkTags
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/9edf40f725ce62b26c454905e39f0f7fdbbb3ffa
https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-cx87-7hhq-m2j3
https://notepad-plus-plus.org/news/v898-released

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Source: NIST National Vulnerability Database (record CVE-2026-85995), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.