Notepad++ < 8.9.7 Multiple Vulnerabilities

The version of Notepad++ installed on the remote host is prior to 8.9.7. It is, therefore, affected by multiple vulnerabilities: - A security bypass vulnerability exists in session.xml backupFilePath handling due to an incomplete startswith check. An attacker could exploit this to bypass path...

PT-2026-58888

Name of the Vulnerable Software and Affected Versions Notepad++ versions prior to 8.9.7 Description The decompress function in WinGup fails to perform canonical containment validation when joining untrusted ZIP entry names to unzipDestTo. This allows a specially crafted ZIP entry, such as...

PT-2026-58886

Name of the Vulnerable Software and Affected Versions Notepad++ versions prior to 8.9.7 Description Notepad++ fails to perform path normalization when validating the backupFilePath attribute from session.xml using the std::wstring::starts with function. This allows the use of parent-directory...

PT-2026-58887

Name of the Vulnerable Software and Affected Versions Notepad++ versions prior to 8.9.7 Description The expandNppEnvironmentStrs function in PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp copies a variable name located between $ and into a fixed-size wchar t strMAX PATH stack buffer...

Notepad++ 8.9.6.2 < 8.9.6.4 TOCTOU Race Condition (CVE-2026-52885)

The version of Notepad++ installed on the remote host is 8.9.6.2 or 8.9.6.3. It is, therefore, affected by a TOCTOU race condition vulnerability: - A time-of-check time-of-use TOCTOU race condition exists in the HMAC verification of shortcuts.xml. The HMAC check validates the on-disk file at...

CVE-2026-48770

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WMCOPYDATA message to Notepad++ using the COPYDATAFULLCMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded...

CVE-2026-48800

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the tag text content inside in shortcuts.xml is read by NppXml::valueaNode Parameters.cpp:3658 in the feedUserCmds function and stored in UserCommand.cmd without any validation. When the user clicks the corresponding entry ...

CVE-2026-52885

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...

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 truste...

CVE-2026-46710

Notepad++ is a free and open-source source code editor. From 8.9.4 until 8.9.6, Notepad++ contains a local privilege escalation vulnerability in the installer. During installation, the installer invokes powershell.exe without using an absolute path after setting the working directory to the...

CVE-2026-48770 Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WMCOPYDATA message to Notepad++ using the COPYDATAFULLCMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded...

CVE-2026-48770

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WMCOPYDATA message to Notepad++ using the COPYDATAFULLCMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded...

CVE-2026-48770

Notepad++ prior to version 8.9.6.1 is affected by multiple issues arising from insecure handling of inter-process communication data. Specifically, a local attacker can trigger a denial of service (CVE-2026-48770) by sending a malformed WM_COPYDATA message where COPYDATA_FULL_CMDLINE is processed...

CVE-2026-48778 Notepad++: Arbitrary Code Execution via config.xml commandLineInterpreter

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the tag in config.xml is read by NppXml::value Parameters.cpp:6430 and stored in nppGUI.commandLineInterpreter without any validation, whitelist, or digital signature check. When the user triggers IDMFILEOPENCMD File → Open...

CVE-2026-48778 Notepad++: Arbitrary Code Execution via config.xml commandLineInterpreter

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the tag in config.xml is read by NppXml::value Parameters.cpp:6430 and stored in nppGUI.commandLineInterpreter without any validation, whitelist, or digital signature check. When the user triggers IDMFILEOPENCMD File → Open...

EUVD-2026-39907

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the tag in config.xml is read by NppXml::value Parameters.cpp:6430 and stored in nppGUI.commandLineInterpreter without any validation, whitelist, or digital signature check. When the user triggers IDMFILEOPENCMD File → Open...

CVE-2026-48778 Notepad++: Arbitrary Code Execution via config.xml commandLineInterpreter

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, the tag in config.xml is read by NppXml::value Parameters.cpp:6430 and stored in nppGUI.commandLineInterpreter without any validation, whitelist, or digital signature check. When the user triggers IDMFILEOPENCMD File → Open...

CVE-2026-48778

Notepad++ prior to 8.9.6.1 is affected by an RCE in config.xml: the value is read without validation and passed to ShellExecute when triggering File → Open Containing Folder → cmd, enabling attacker-controlled executable paths. The issue stems from NppXml::value() storing the value in _nppGUI._c...

CVE-2026-52885

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...

CVE-2026-52885 Notepad++ TOCTOU: HMAC Checks Disk, Executes from Memory

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...