Notepad++: Authenticode verification bypass allows modified updater execution

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85995
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-22 18:17:23 UTC
Updated2026-09-23 18:28:25 UTC
DescriptionNotepad++ 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.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

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

EPSS: 0.001240000 probability, percentile 0.025010000 (date 2026-09-23)

Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Notepad-plus-plus Notepad-plus-plus affected < 8.9.8 Not specified

References

ReferenceSourceLinkTags
notepad-plus-plus.org/news/v898-released [email protected] notepad-plus-plus.org
github.com/notepad-plus-plus/notepad-plus-plus/commit/9edf40f725ce62b26c... [email protected] github.com
github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 [email protected] github.com
github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-... [email protected] github.com
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