The Contest Gallery plugin for WordPress is vulnerable to privilege escalation via account takeover in all versions up to, and including, 24.0.7. This is due to the plugin not properly validating a user's identity prior to updating their password. This makes it possible for unauthenticated attackers to change arbitrary user's passwords, including administrators, and leverage that to gain access to their account.

The Contest Gallery WordPress plugin before 13.1.0.6 does not have capability checks and does not sanitise or escape the cg-search-user-name-original parameter before using it in a SQL statement when exporting users from a gallery, which could allow unauthenticated to perform SQL injections attacks, as well as get the list of all users registered on the blog, including their username and email address

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Wasiliy Strecker / ContestGallery developer Contest Gallery contest-gallery.This issue affects Contest Gallery: from n/a through <= 21.3.2.

The Contest Gallery – Upload & Vote Photos, Media, Sell with PayPal & Stripe plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 30.0.2 via the RegistryUserRole parameter. This is due to the plugin's admin menu being registered at the editposts capability level — granting Contributor-level users access to the plugin's admin pages and a valid cgadmin nonce — while the option-saving handler in change-options-and-sizes.php performs no currentusercan() capability check beyond checkadminreferer('cgadmin'), and the RegistryUserRole value is processed only through sanitizetextfield() and htmlentities() without restriction to an allowlist of permitted role names. This makes it possible for authenticated attackers, with author-level access and above, to overwrite the plugin's stored RegistryUserRole option with administrator, which the cgcreatewpuserfromgoogleuser function then reads back from the contestgal1eryregistryandloginoptions database table without any allowlist validation and passes directly to wpupdateuser(), effectively promoting a newly registered Google sign-in account to Administrator.

The Contest Gallery plugin for WordPress is vulnerable to an authentication bypass leading to admin account takeover in all versions up to, and including, 28.1.5. This is due to the email confirmation handler in users-registry-check-after-email-or-pin-confirmation.php using the user's email string in a WHERE ID = %s clause instead of the numeric user ID, combined with an unauthenticated key-based login endpoint in ajax-functions-frontend.php. When the non-default RegMailOptional=1 setting is enabled, an attacker can register with a crafted email starting with the target user ID (e.g., 1poc@example.test), trigger the confirmation flow to overwrite the admin's useractivationkey via MySQL integer coercion, and then use the postcg1lloginuserbykey AJAX action to authenticate as the admin without any credentials. This makes it possible for unauthenticated attackers to take over any WordPress administrator account and gain full site control.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Wasiliy Strecker / ContestGallery developer Contest Gallery contest-gallery allows SQL Injection.This issue affects Contest Gallery: from n/a through <= 25.1.0.

The Contest Gallery plugin for WordPress is vulnerable to SQL Injection via the 'forminput' parameter in versions up to, and including, 28.1.6. This is due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query inside the unauthenticated 'postcggalleryformupload' AJAX action (specifically the 'cb' branch of the included users-upload-check.php, where $finputid is concatenated unquoted into 'SELECT FieldContent FROM ... WHERE id = $finputid'). The endpoint is gated only by a public frontend nonce ('cg1laction' / 'cgnonce') that is exposed in the page source of any public gallery page. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

Contest Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘id’ parameter in all versions up to, and including, 26.0.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Photos, Files, YouTube, Twitter, Instagram, TikTok, Ecommerce Contest Gallery – Upload, Vote, Sell via PayPal or Stripe, Social Share Buttons, OpenAI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'upload[1][title]' parameter in all versions up to, and including, 26.0.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Contest Gallery – Upload, Vote & Sell with PayPal and Stripe plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple form field parameters in all versions up to, and including, 27.0.2. This is due to insufficient input sanitization and output escaping on user-supplied attributes. This makes it possible for authenticated attackers, with author-level access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Wasiliy Strecker / ContestGallery developer Contest Gallery contest-gallery allows Stored XSS.This issue affects Contest Gallery: from n/a through <= 24.0.3.

The Contest Gallery – Upload, Vote & Sell with PayPal and Stripe plugin for WordPress is vulnerable to CSV Injection in all versions up to, and including, 27.0.3 via gallery submissions. This makes it possible for unauthenticated attackers to embed untrusted input into exported CSV files, which can result in code execution when these files are downloaded and opened on a local system with a vulnerable configuration.