Expresstech Quiz and Survey Master Plugin up to 11.2.9 on WordPress Shortcode display_shortcode qpages sql injection

Summaryinfo

A vulnerability, which was classified as critical, was found in Expresstech Quiz and Survey Master Plugin up to 11.2.9. Affected by this issue is the function display_shortcode of the component Shortcode Handler. Executing a manipulation of the argument qpages can lead to sql injection. This vulnerability is registered as CVE-2026-116509. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Expresstech Quiz and Survey Master Plugin up to 11.2.9. This vulnerability affects the function display_shortcode of the component Shortcode Handler. The manipulation of the argument qpages 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. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to generic SQL Injection via the 'qpages' parameter in all versions up to, and including, 11.2.9 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with contributor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. The injected payload survives storage and a published-status check in display_shortcode() because a non-numeric ID causes the isPublished lookup to return an empty string, after which the payload is imploded directly into a WHERE question_id IN() clause via plain string interpolation with no wpdb->prepare() or esc_sql() call.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-116509 since 10/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/13/2026). This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• Expresstech

Name

• Quiz and Survey Master Plugin

Version

• 11.2.0
• 11.2.1
• 11.2.2
• 11.2.3
• 11.2.4
• 11.2.5
• 11.2.6
• 11.2.7
• 11.2.8
• 11.2.9

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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