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CVE-2025-30167 — Jupyter Core on Windows Has Uncontrolled Search Path Element Local Privilege Escalation Vulnerability

Affected: jupyter_core

Jupyter Core is a package for the core common functionality of Jupyter projects. When using Jupyter Core prior to version 5.8.0 on Windows, the shared `%PROGRAMDATA%` directory is searched for configuration files (`SYSTEM_CONFIG_PATH` and `SYSTEM_JUPYTER_PATH`), which may allow users to create configuration files affecting other users. Only shared Windows systems with multiple users and unprotected `%PROGRAMDATA%` are affected. Users should upgrade to Jupyter Core version 5.8.0 or later to receive a patch. Some other mitigations are available. As administrator, modify the permissions on the `%PROGRAMDATA%` directory so it is not writable by unauthorized users; or as administrator, create the `%PROGRAMDATA%\jupyter` directory with appropriately restrictive permissions; or as user or administrator, set the `%PROGRAMDATA%` environment variable to a directory with appropriately restrictive permissions (e.g. controlled by administrators _or_ the current user).

GHSA-33p9-3p43-82vq — Jupyter Core on Windows Has Uncontrolled Search Path Element Local Privilege Escalation Vulnerability

Affected: PyPI: jupyter_core

## Impact

On Windows, the shared `%PROGRAMDATA%` directory is searched for configuration files (`SYSTEM_CONFIG_PATH` and `SYSTEM_JUPYTER_PATH`), which may allow users to create configuration files affecting other users.

Only shared Windows systems with multiple users and unprotected `%PROGRAMDATA%` are affected.

## Mitigations

- upgrade to `jupyter_core>=5.8.1` (5.8.0 is patched but breaks `jupyter-server`) , or - as administrator, modify the permissions on the `%PROGRAMDATA%` directory so it is not writable by unauthorized users, or - as administrator, create the `%PROGRAMDATA%\jupyter` directory with appropriately restrictive permissions, or - as user or administrator, set the `%PROGRAMDATA%` environment variable to a directory with appropriately restrictive permissions (e.g. controlled by administrators _or_ the current user)

## Credit

Reported via Trend Micro Zero Day Initiative as ZDI-CAN-25932

PYSEC-2026-1477 — Jupyter Core on Windows Has Uncontrolled Search Path Element Local Privilege Escalation Vulnerability

Affected: PyPI: jupyter-core

## Impact

Only shared Windows systems with multiple users and unprotected `%PROGRAMDATA%` are affected.

## Mitigations

## Credit

Reported via Trend Micro Zero Day Initiative as ZDI-CAN-25932