NodeBB v4.3.0 is vulnerable to SQL injection in its search-categories API endpoint (/api/v3/search/categories). The search query parameter is not properly sanitized, allowing unauthenticated, remote attackers to inject boolean-based blind and PostgreSQL error-based payloads.
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.