CVE-2023-6449

Contact Form 7 <= 5.8.3 - Authenticated (Editor+) Arbitrary File Upload

The Contact Form 7 plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'validate' function and insufficient blocklisting on the 'wpcf7_antiscript_file_name' function in versions up to, and including, 5.8.3. This makes it possible for authenticated attackers with editor-level capabilities or above to upload arbitrary files on the affected site's server, but due to the htaccess configuration, remote code cannot be executed in most cases. By default, the file will be deleted from the server immediately. However, in some cases, other plugins may make it possible for the file to live on the server longer. This can make remote code execution possible when combined with another vulnerability, such as local file inclusion.

We have discovered 1,187,373 live websites that are affected by CVE-2023-6449.

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Affected Software

Product  Contact Form 7
Category Form Builders
Vulnerable Domains1,187,373 live websites (33% of Contact Form 7 install base)
Vulnerable Versions
  • from 0 through 5.8.3
Vulnerable Versions Count84 versions ( 68% of all versions)


Common Weakness Enumeration

CWE-434 Unrestricted Upload of File with Dangerous Type



Details

  • Published - Dec 1, 2023
  • Updated - Apr 8, 2026

Credits

  • István Márton (finder)

Website Distribution by Country

Number of websites using CVE-2023-6449
United States214,970 websites


Japan138,120 websites
Germany106,829 websites
France75,220 websites
Italy66,724 websites
Russia54,874 websites
GB46,165 websites
Spain39,192 websites
Poland36,725 websites
Netherlands34,610 websites

Website Distribution by TLD

Number of websites using CVE-2023-6449
.com459,089 websites
.de59,769 websites
.it46,420 websites
.ru44,378 websites
.org36,098 websites
.net31,441 websites
.fr30,682 websites
.jp30,018 websites
.nl29,730 websites
.co.uk28,871 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2023-6449

Top websites that are affected by CVE-2023-6449. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
****.br Brazil***
********.com Singapore*,***
************.com United States*,***
*******.org United States*,***
*********.com United States*,***
***************.com United States*,***
*********.com United States*,***
*****.****.br Brazil*,***
********.****.br Brazil*,***
*********.com United States*,***
See full domain list

FAQ

CVE-2023-6449 is Unrestricted Upload of File with Dangerous Type in Contact Form 7
A total of 1,187,373 websites have been identified as vulnerable to CVE-2023-6449, based on global website indexing conducted by WebTechSurvey.
The Contact Form 7 is affected by the CVE-2023-6449 vulnerability.
Contact Form 7 versions up to and including 5.8.3 are vulnerable to CVE-2023-6449.