Overview
Injection vulnerabilities like CWE-89 have real-world impact: attackers can read, modify, or exfiltrate data by injecting SQL through unsanitized inputs. CVE-2026-26001 describes a SQL injection in the GLPI Inventory Plugin where un sanitized user input in reports could be exploited by an attacker with adequate rights, leading to unauthorized data access. Although this CVE targets a PHP application, its risk pattern-concatenating untrusted input into SQL queries-illustrates a universal danger for any web app, including Go services built with Gin. The underlying issue is that query strings built from user input can alter the intended SQL logic if not properly parameterized, enabling attackers to bypass authentication, leak sensitive rows, or perform data manipulation (CWE-89). This guide references CVE-2026-26001 to ground the discussion in a concrete injection scenario and translates the lessons to idiomatic Go (Gin) practices to prevent similar exploits. The example focuses on SQL injection via interpolated inputs and emphasizes how Go code should avoid these patterns.
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"
)
func main() {
dsn := "user:pass@tcp(localhost:3306)/testdb"
db, err := sql.Open("mysql", dsn)
if err != nil {
log.Fatal(err)
}
defer db.Close()
r := gin.Default()
// Vulnerable pattern: string concatenation with untrusted input
r.GET("/vuln/users", func(c *gin.Context) {
id := c.Query("id")
q := "SELECT id, name FROM users WHERE id = " + id
rows, err := db.Query(q)
if err != nil {
c.String(http.StatusInternalServerError, "query error")
return
}
rows.Close()
c.Status(http.StatusOK)
})
// Fixed pattern: parameterized queries
r.GET("/safe/users", func(c *gin.Context) {
id := c.Query("id")
rows, err := db.Query("SELECT id, name FROM users WHERE id = ?", id)
if err != nil {
c.String(http.StatusInternalServerError, "query error")
return
}
rows.Close()
c.Status(http.StatusOK)
})
r.Run(":8080")
}