Overview
CVE-2026-5368 describes a SQL injection vulnerability in the Car Rental Project 1.0 where the uname argument in login.php is concatenated into a SQL query, enabling remote exploitation. This is registered under CWE-89 (SQL Injection) and related CWE-74 smells around improper neutralization of input. While the original disclosure targets PHP, the underlying flaw-building SQL with unsanitized user input-occurs in any web stack, including Go applications using Gin.
Attackers can supply a specially crafted uname value that closes the string and injects arbitrary SQL, potentially bypassing authentication or exfiltrating data. In Go with Gin, this risk arises when developers construct queries with string concatenation or fmt.Sprintf using values from form, query, or JSON inputs instead of using parameterized queries.
Remediation in Go (Gin) centers on using parameterized queries, input binding with validation, and proper password handling. Always pass user inputs as parameters to the database driver, avoid string interpolation, validate inputs with Gin binding, and hash passwords (e.g., bcrypt) rather than storing or comparing plaintext. The code example below demonstrates the vulnerable pattern and a secure, parameterized alternative.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"database/sql"
"fmt"
"log"
"github.com/gin-gonic/gin"
_ "github.com/lib/pq"
)
type LoginInput struct {
Uname string `form:"uname" json:"uname" binding:"required"`
Password string `form:"password" json:"password" binding:"required"`
}
var db *sql.DB
func main() {
var err error
db, err = sql.Open("postgres", "postgres://user:pass@localhost/dbname?sslmode=disable")
if err != nil {
log.Fatal(err)
}
// Note: server startup omitted for brevity in this snippet
}
// Vulnerable: string interpolation used to build SQL
func loginVuln(c *gin.Context) {
var in LoginInput
if err := c.ShouldBind(&in); err != nil {
c.JSON(400, gin.H{"error": "invalid"})
return
}
query := fmt.Sprintf("SELECT id FROM users WHERE username = '%s' AND password = '%s'", in.Uname, in.Password)
var id int
if err := db.QueryRow(query).Scan(&id); err != nil {
c.JSON(401, gin.H{"error": "unauthorized"})
return
}
c.JSON(200, gin.H{"id": id})
}
// Fixed: parameterized query prevents SQL injection
func loginFixed(c *gin.Context) {
var in LoginInput
if err := c.ShouldBind(&in); err != nil {
c.JSON(400, gin.H{"error": "invalid"})
return
}
var id int
if err := db.QueryRow("SELECT id FROM users WHERE username = $1 AND password_hash = $2", in.Uname, in.Password).Scan(&id); err != nil {
c.JSON(401, gin.H{"error": "unauthorized"})
return
}
c.JSON(200, gin.H{"id": id})
}