--- id: CVE-2025-66470 aliases: - GHSA-2m4f-cg75-76w2 - PYSEC-2026-1696 title: >- NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content summary: >- NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content severity: medium cvss: 6.1 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N' vendor: nicegui product: nicegui ecosystem: pip affected: - nicegui < 3.4.0 patched: - nicegui 3.4.0 published: '2025-12-08' updated: '2026-07-07' source: OSV sourceUrl: 'https://osv.dev/vulnerability/GHSA-2m4f-cg75-76w2' references: - url: >- https://github.com/zauberzeug/nicegui/security/advisories/GHSA-2m4f-cg75-76w2 - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66470' - url: >- https://github.com/zauberzeug/nicegui/commit/58ad0b36e19922de16bbc79ea3ddd29851b1a3e3 - url: 'https://github.com/zauberzeug/nicegui' tags: - osv - pip - exploit-available epss: 0.00254 epssPercentile: 0.15124 ingestedAt: '2026-07-08T18:25:44.559Z' exploits: github: 1 githubRepos: - 'https://github.com/Jmehta10/CVE-2025-66470' checkedAt: '2026-09-26T09:05:34.704Z' exploitAvailable: true --- ## Overview ### Summary A Cross-Site Scripting (XSS) vulnerability exists in the `ui.interactive_image` component of NiceGUI (v3.3.1 and earlier). 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 `` tag. ### Details The vulnerability is located in `nicegui/elements/interactive_image.js`. The component uses the following code to render content: ```javascript ``` Vue's v-html directive renders raw HTML strings into the DOM. If an application allows user-controlled input to be passed to the content property of an interactive image, an attacker can embed a tag containing malicious scripts, bypassing typical image restrictions. ### PoC ```python from nicegui import ui @ui.page('/') def main(): ui.label('NiceGUI SVG XSS PoC') # Standard image loading img = ui.interactive_image('[https://picsum.photos/640/360](https://picsum.photos/640/360)') # Payload: Embeds raw HTML execution inside SVG # This executes immediately when the image component is rendered img.content = ( '' '' '

' '' '' ) ui.run() ``` ### Impact - Type: Reflected / Stored XSS (depending on data source) - Severity: Moderate - Impact: Attackers can inject malicious scripts that execute whenever the image component is rendered or updated. This is particularly dangerous for dashboards or multi-user applications displaying user-generated content or annotations. ## Affected packages - `nicegui < 3.4.0` ## Remediation Upgrade to a patched release: - `nicegui 3.4.0`