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    CVE-2026-52884

    Notepad++ is a free and open-source source code editor. In v8.9.6.1, isInTrustedDirectory() does NOT canonicalize the path before checking. It uses a prefix-based check (PathIsPrefix() or equivalent) that matches paths starting with trusted directory strings. A path traversal using ..\..\ after a trusted directory prefix passes the check while resolving to an untrusted location. The CVE-2026-48800 patch adds isInTrustedDirectory() validation in Command::run() (RunDlg.cpp) before calling ShellExecute(). This function checks whether the resolved executable path is under a trusted directory. This vulnerability is fixed in 8.9.6.2.

    Published:Jun 26, 2026
    Last Modified:Jun 29, 2026
    EPS:Jun 26, 2026
    EPSS Score:0.00147
    CVSS Score:7.8

    Affected Products

    Vendor
    Notepad-plus-plus
    Product
    Notepad++

    Exploits

    https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-p58x-r3c9-x9p6

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-52886 (CVSS 5.1) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, Notepad++ validates the backupFilePath…
    CVE-2026-71858 (CVSS 5.4) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, macros loaded from an attacker-control…
    CVE-2026-54758 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the expandNppEnvironmentStrs function …
    CVE-2026-73250 (CVSS 5.4) — Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the Notepad++ Windows 11 x64 and ARM64…
    CVE-2026-48770 (CVSS 5) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interact…
    CVE-2026-48778 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <GUIConfig name="commandLineInte…
    CVE-2026-52885 (CVSS 7.5) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.4, NppCommands.cpp checks the HMAC of t…
    CVE-2026-46710 (CVSS 7.5) — Notepad++ is a free and open-source source code editor. From 8.9.4 until 8.9.6, Notepad++ contains a local pri…
    CVE-2026-48800 (CVSS 7.8) — Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the <Command> tag text content insid…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High