Overview
Injection vulnerabilities are among the most dangerous exposure vectors. The CVE-2026-35566 case shows a critical SQL injection in ChurchCRM prior to 7.1.0 where a session-derived value iCurrentFundraiser was used directly in a numeric SQL context without integer validation. An attacker who could control or influence that session value could alter the query logic, potentially retrieving or mutating sensitive fundraiser data. This aligns with CWE-89, SQL Injection, and demonstrates how insufficient input handling enables attackers to break data boundaries. The vulnerability was fixed in ChurchCRM's 7.1.0 release, underscoring the importance of strict input validation and safe query construction.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"database/sql"
"fmt"
"log"
"net/http"
"strconv"
"github.com/gin-gonic/gin"
_ "github.com/go-sql-driver/mysql" // replace with your driver
)
// Vulnerable pattern (illustrative, not production-ready):
func vulnerablePattern(db *sql.DB) gin.HandlerFunc {
return func(c *gin.Context) {
// Simulated session value (in real apps, read from a session store)
v := c.Query("iCurrentFundraiser") // attacker-controlled via query for demonstration
// Vulnerable: direct string interpolation into SQL (no validation)
query := fmt.Sprintf("SELECT * FROM FundRaiserStatement WHERE id = %s", v)
rows, err := db.Query(query)
if err != nil {
c.String(http.StatusInternalServerError, "error: %v", err)
return
}
_ = rows.Close()
c.String(http.StatusOK, "vulnerable query executed")
}
}
// Fixed pattern (safe):
func fixedPattern(db *sql.DB) gin.HandlerFunc {
return func(c *gin.Context) {
v := c.Query("iCurrentFundraiser")
id, err := strconv.Atoi(v)
if err != nil {
c.String(http.StatusBadRequest, "invalid id")
return
}
// Use parameterized query to prevent injection
rows, err := db.Query("SELECT * FROM FundRaiserStatement WHERE id = ?", id)
if err != nil {
c.String(http.StatusInternalServerError, "error: %v", err)
return
}
_ = rows.Close()
c.String(http.StatusOK, "safe query executed")
}
}
func main() {
// NOTE: This is illustrative. Replace DSN with real credentials and configure the driver properly.
dsn := "user:password@tcp(127.0.0.1:3306)/example"
db, err := sql.Open("mysql", dsn)
if err != nil {
log.Fatal(err)
}
defer db.Close()
r := gin.Default()
r.GET("/vuln", vulnerablePattern(db))
r.GET("/fix", fixedPattern(db))
// For demonstration only; in real usage, run r.Run() and provide proper server setup.
_ = r
_ = fmt.Sprintf
}