CVE-2026-2412 PUBLISHED

Quiz and Survey Master (QSM) <= 10.3.5 - Authenticated (Contributor+) SQL Injection via 'merged_question' Parameter

Assigner: Wordfence
Reserved: 12.02.2026 Published: 23.03.2026 Updated: 23.03.2026

The Quiz and Survey Master (QSM) plugin for WordPress is vulnerable to SQL Injection via the 'merged_question' parameter in all versions up to, and including, 10.3.5. This is due to insufficient sanitization of user-supplied input before being used in a SQL query. The sanitize_text_field() function applied to the merged_question parameter does not prevent SQL metacharacters like ), OR, AND, and # from being included in the value, which is then directly concatenated into a SQL IN() clause without using $wpdb->prepare() or casting values to integers. 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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 6.5

Product Status

Vendor expresstech
Product Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker
Versions Default: unaffected
  • affected from * to 10.3.5 (incl.)

Credits

  • Thanh Hao finder

References

Problem Types

  • CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') CWE