CVE-2025-53354

NiceGUI versions 2.22.0 to 3.4.1 have an unsafe implementation in the pushstate event listener used by ui.sub_pages, allowing an attacker to manipulate the fragment identifier of the URL, even cross-site, using an iframe. This issue has been patched in version 3.5.0.

NiceGUI is a Python-based UI framework. Prior to version 3.12.0, two FastAPI routes that serve per-component static assets in NiceGUI accept a sub-path parameter that may resolve to a directory rather than a file. Requests that resolve to a directory raise an unhandled RuntimeError inside Starlette's FileResponse, which Uvicorn writes to the server log as a full traceback. Because the routes are reachable without authentication, a remote attacker can amplify log volume and consume disk and log-pipeline capacity on any publicly reachable NiceGUI server. This issue has been patched in version 3.12.0.

NiceGUI prior to version 3.12.0 has a vulnerability in ui.restructured_text() that renders reStructuredText server-side without disabling file insertion directives. An attacker can read local files accessible to the NiceGUI server process.

NiceGUI, a Python-based UI framework, prior to version 3.10.0 is vulnerable to arbitrary file write on Windows. Because PurePosixPath only recognizes forward slashes (/) as path separators, an attacker can bypass sanitization by using backslashes (\) in the upload filename.

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are subject to an XSS vulnerability through the ui.interactive_image component, which renders SVG content using Vue's v-html directive without any sanitization. An attacker can inject malicious HTML or JavaScript via the SVG <foreignObject> tag whenever the image component is rendered or updated.