expresstech Quiz and Survey Master Plugin up to 11.2.0 on WordPress AJAX handler qsm_ajax_save_pages sql injection

Summaryinfo

A vulnerability was found in expresstech Quiz and Survey Master Plugin up to 11.2.0. It has been classified as critical. Affected by this vulnerability is the function qsm_ajax_save_pages of the component AJAX handler. This manipulation of the argument pages causes sql injection. The identification of this vulnerability is CVE-2026-13767. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in expresstech Quiz and Survey Master Plugin up to 11.2.0 and classified as critical. Affected by this vulnerability is the function qsm_ajax_save_pages of the component AJAX handler. The manipulation of the argument pages with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Quiz Master Next plugin for WordPress is vulnerable to SQL Injection via stored quiz page data in versions up to, and including, 11.2.0. This is due to insufficient escaping on the user-supplied 'pages' parameter persisted by the qsm_ajax_save_pages() AJAX handler (sanitize_text_field only) and lack of sufficient preparation on the existing SQL query built in qsm_options_questions_tab_content() at line 143, where the stored page IDs are interpolated into an IN() clause via implode() with no $wpdb->prepare() and no integer casting. This makes it possible for authenticated attackers, with Author-level access and above (who can own a quiz they are entitled to edit), to plant a SQL payload that is executed second-order whenever any user (including an administrator) views the quiz's Questions tab, allowing them to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-13767 since 06/29/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/16/2026). MITRE ATT&CK project uses the attack technique T1505 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• expresstech

Name

• Quiz and Survey Master Plugin

Version

• 11.0
• 11.1
• 11.2.0

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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