CVE-2025-66470 NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content
Attackers can inject malicious scripts via unsanitized SVG content in NiceGUI's interactive image component, affecting multi-user applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-66470?
CVE-2025-66470 is a medium-severity cross-site scripting vulnerability in zauberzeug nicegui, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are subject to a XSS vulnerability through the ui.interactive_image component of NiceGUI. The component renders SVG content using Vue's v-html directive without any sanitization. This allows attackers to inject malicious HTML or JavaScript via the SVG <foreignObject> tag whenever the image component is rendered or updated. This is particularly dangerous for dashboards or multi-user applications displaying user-generated content or annotations. This issue is fixed in version 3.4.0.
Weakness: CWE-79
Which versions are affected by CVE-2025-66470?
3 open source packages ship an affected version, including nicegui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nicegui PyPI | All versions | 3.4.0 |
nicegui PyPI | All versions | 3.4.0 |
nicegui PyPI | All versions | 3.4.0 |
Products include Zauberzeug Nicegui.
How do I fix CVE-2025-66470?
Upgrade nicegui to 3.4.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-66470 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66470 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in zauberzeug nicegui
- CVE-2026-25732 NiceGUI's Path Traversal via Unsanitized FileUpload.name Enables Arbitrary File Write
- CVE-2025-66645 NiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File Reading
- CVE-2026-21873 Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`
- CVE-2026-33332 NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
- CVE-2026-27156 NiceGUI has XSS via Code Injection
Sources
Also known as GHSA-2m4f-cg75-76w2, PYSEC-2026-1696.