Overview
CVE-2026-1800 describes a time-based SQL injection vulnerability in The Fonts Manager | Custom Fonts plugin for WordPress, where the fmcfIdSelectedFnt parameter could be exploited to append additional SQL statements to an existing query. All versions up to 1.2 were affected due to insufficient escaping of the user-supplied parameter and lack of proper preparation of the SQL query, enabling unauthenticated attackers to extract sensitive data. This is classified under CWE-89 (SQL Injection). In Go applications using the Gin framework, a comparable risk arises when user input from HTTP requests is concatenated into SQL strings without parameter binding, allowing attackers to alter query logic and, in time-based variants, cause delays that reveal data characteristics or exfiltrate data through side channels. This guide demonstrates how such patterns manifest in Go (Gin) and how to remediate them with proper parameterized queries and defensive coding.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"database/sql"
"log"
"net/http"
"github.com/gin-gonic/gin"
_ "github.com/go-sql-driver/mysql" // MySQL driver; adjust for your DB
)
func main() {
// Note: Use a real DSN configured for your environment. This is a minimal example.
dsn := "user:password@tcp(127.0.0.1:3306)/exampledb"
db, err := sql.Open("mysql", dsn)
if err != nil {
log.Fatal(err)
}
defer db.Close()
r := gin.Default()
// Vulnerable pattern: concatenating user input into SQL (demonstration only)
r.GET("/vuln-font", func(c *gin.Context) {
id := c.Query("fmcfIdSelectedFnt")
// POTENTIAL RISK: user input is directly concatenated into SQL
query := "SELECT id, font_name FROM fonts WHERE id = " + id
rows, err := db.Query(query)
if err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": "query failed"})
return
}
defer rows.Close()
c.JSON(http.StatusOK, gin.H{"status": "vulnerable"})
})
// Fixed pattern: use parameterized queries to prevent injection
r.GET("/fix-font", func(c *gin.Context) {
id := c.Query("fmcfIdSelectedFnt")
// Use a parameter placeholder appropriate for the driver (e.g., ? for MySQL, $1 for PostgreSQL)
query := "SELECT id, font_name FROM fonts WHERE id = ?"
rows, err := db.Query(query, id)
if err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": "query failed"})
return
}
defer rows.Close()
c.JSON(http.StatusOK, gin.H{"status": "fixed"})
})
r.Run(":8080")
}