Overview
CVE-2026-8098 describes a SQL injection vulnerability in code-projects Feedback System 1.0, where an attacker can manipulate an email parameter in admin/checklogin.php to alter the SQL query. While this CVE targets a PHP app and references CWE-74 (Improper Input Validation) and CWE-89 (SQL Injection), the underlying failure mode is the same in Go (Gin) applications: constructing SQL queries by concatenating user-supplied input without parameterization. The public exploit highlights the real-world impact of unvalidated input and weak query handling in a web app that exposes login logic to remote attackers.
In a Go (Gin) app, an attacker could supply crafted values to a login handler that interpolates the email or other user inputs into a SQL string. For example, if code concatenates email and password into a query, an attacker could bypass authentication, access other user data, or modify the database. Such issues can be exploited remotely and are particularly dangerous when authentication gates are exposed.
Remediation in Go (Gin): use parameterized queries with placeholders, never interpolate user input into SQL; bind and validate inputs with Gin's binding and the validator; prefer prepared statements or an ORM that uses parameterization; limit database privilege; log anomalies; treat login endpoints as sensitive; include test coverage for injection-like inputs. The example below shows vulnerable and fixed patterns in a small Go (Gin) app, including a DB connection from a DSN environment variable to keep credentials out of source control.
In short, this pattern mirrors the CWE-89 risk class highlighted by CVE-2026-8098 and demonstrates how to fix it in Go (Gin) by adopting parameterized queries and input validation.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"database/sql"
"log"
"net/http"
"os"
"github.com/gin-gonic/gin"
_ "github.com/go-sql-driver/mysql"
)
var db *sql.DB
func main() {
dsn := os.Getenv("DB_DSN")
if dsn == "" {
log.Fatal("DB_DSN environment variable not set")
}
var err error
db, err = sql.Open("mysql", dsn)
if err != nil {
log.Fatal(err)
}
if err = db.Ping(); err != nil {
log.Fatal(err)
}
r := gin.Default()
r.POST("/login_vuln", vulnerableLogin)
r.POST("/login_fix", fixedLogin)
if err := r.Run(":8080"); err != nil {
log.Fatal(err)
}
}
// Vulnerable pattern: SQL is built via string concatenation with user input
func vulnerableLogin(c *gin.Context) {
email := c.PostForm("email")
password := c.PostForm("password")
// WARNING: vulnerable to SQL injection
query := "SELECT id FROM users WHERE email = '" + email + "' AND password = '" + password + "'"
var id int
err := db.QueryRow(query).Scan(&id)
if err != nil {
c.JSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
return
}
c.JSON(http.StatusOK, gin.H{"id": id})
}
// Fixed pattern: parameterized query using placeholders
func fixedLogin(c *gin.Context) {
email := c.PostForm("email")
password := c.PostForm("password")
var id int
err := db.QueryRow("SELECT id FROM users WHERE email = ? AND password = ?", email, password).Scan(&id)
if err != nil {
c.JSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
return
}
c.JSON(http.StatusOK, gin.H{"id": id})
}