Overview
Injection vulnerabilities allow attackers to alter SQL queries by injecting crafted input. CVE-2026-30463 shows a SQL injection in Daylight Studio FuelCMS v1.5.2 via the /controllers/Login.php component, illustrating how untrusted input can lead to unauthorized data access. Although this CVE targets a PHP application, the underlying class of vulnerability-unsafe query construction-applies to any web app that builds SQL strings from user input.
In Go with Gin, similar risks arise if you concatenate input into SQL commands instead of parameterizing. An attacker could manipulate login data to bypass authentication, reveal user records, or execute additional statements. The FuelCMS case underscores that failure to properly parameterize queries is a universal risk, not limited to PHP.
To fix this in Go (Gin), use parameterized queries or an ORM that handles parameter binding, validate and constrain inputs, and apply least privilege for the database user. The remediation also includes secure error handling, logging, and regular code reviews to catch string-concatenation patterns before deployment.
Below is a concise example showing a vulnerable Gin handler side-by-side with a fixed, parameterized version. This demonstrates how to implement safe patterns in production Go services.
Affected Versions
FuelCMS v1.5.2
Code Fix Example
Go (Gin) API Security Remediation
package main\n\nimport (\n "database/sql"\n "log"\n "net/http"\n "github.com/gin-gonic/gin"\n _ "github.com/go-sql-driver/mysql"\n)\n\nvar db *sql.DB\n\ntype Credentials struct {\n Username string\n Password string\n}\n\nfunc main() {\n var err error\n db, err = sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/dbname")\n if err != nil { log.Fatal(err) }\n defer db.Close()\n\n r := gin.Default()\n r.POST("/login-vuln", loginVuln)\n r.POST("/login-fixed", loginFixed)\n r.Run(":8080")\n}\n\nfunc loginVuln(c *gin.Context) {\n var cred Credentials\n if err := c.ShouldBindJSON(&cred); err != nil {\n c.JSON(http.StatusBadRequest, gin.H{\"error\": \"bad request\"})\n return\n }\n // Vulnerable: string concatenation\n query := \"SELECT id FROM users WHERE username = '\" + cred.Username + \"' AND password = '\" + cred.Password + \"'\"\n var id int\n if err := db.QueryRow(query).Scan(&id); err != nil {\n if err == sql.ErrNoRows { c.JSON(http.StatusUnauthorized, gin.H{\"error\": \"invalid credentials\"}); return }\n c.JSON(http.StatusInternalServerError, gin.H{\"error\": \"internal error\"}); return\n }\n c.JSON(http.StatusOK, gin.H{\"id\": id})\n}\n\nfunc loginFixed(c *gin.Context) {\n var cred Credentials\n if err := c.ShouldBindJSON(&cred); err != nil {\n c.JSON(http.StatusBadRequest, gin.H{\"error\": \"bad request\"})\n return\n }\n // Fixed: parameterized query\n query := \"SELECT id FROM users WHERE username = ? AND password = ?\"\n var id int\n if err := db.QueryRow(query, cred.Username, cred.Password).Scan(&id); err != nil {\n if err == sql.ErrNoRows { c.JSON(http.StatusUnauthorized, gin.H{\"error\": \"invalid credentials\"}); return }\n c.JSON(http.StatusInternalServerError, gin.H{\"error\": \"internal error\"}); return\n }\n c.JSON(http.StatusOK, gin.H{\"id\": id})\n}\n