Overview
CVE-2026-7626 documents a severe information exposure in the Slek Gateway for WooCommerce WordPress plugin (v1.0) where the merchant's slek_key and slek_secret API credentials are placed directly into a client-side HTML form and the slek_secret is embedded as a plaintext GET parameter in the IPN callback URL. An attacker who can place an order could view the page source or DevTools before the auto-submit fires and extract credentials, enabling unauthorized access to the merchant account. This is categorized under CWE-200: Information Exposure. In the Go (Gin) ecosystem, this kind of vulnerability is closely related to Broken Object Property Level Authorization, where sensitive fields are leaked through API responses or insufficient per-object checks, allowing unauthorized access to attributes a user should not see. The CVE illustrates how credentials can be exposed to the client and exploited via legitimate flows, underscoring the need for strict data handling on server side and secure client-facing surfaces. The remediation pattern here is to ensure property-level access checks and to exclude sensitive fields from any API payload that could be consumed by an authenticated or unauthenticated client.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"net/http"
"github.com/gin-gonic/gin"
)
type Order struct {
ID int `json:"id"`
OwnerID int `json:"owner_id"`
SensitiveToken string `json:"sensitive_token"`
}
type OrderPublic struct {
ID int `json:"id"`
OwnerID int `json:"owner_id"`
}
func main() {
r := gin.Default()
r.GET("/vuln/orders/:id", getOrderVulnerable)
r.GET("/fixed/orders/:id", getOrderFixed)
// Middleware should set user_id in context for auth checks (example only)
r.Run()
}
// Vulnerable: returns sensitive data to client
func getOrderVulnerable(c *gin.Context) {
order := Order{ID: 1, OwnerID: 42, SensitiveToken: "SECRET_TOKEN"}
// Vulnerable: exposes SensitiveToken in response
c.JSON(http.StatusOK, order)
}
// Fixed: enforces per-object authorization and hides sensitive data
func getOrderFixed(c *gin.Context) {
order := Order{ID: 1, OwnerID: 42, SensitiveToken: "SECRET_TOKEN"}
// Simulated authentication: retrieve user_id from context
user, exists := c.Get("user_id")
if !exists {
c.JSON(http.StatusUnauthorized, gin.H{"error": "unauthenticated"})
return
}
userID, ok := user.(int)
if !ok || userID != order.OwnerID {
c.JSON(http.StatusForbidden, gin.H{"error": "forbidden"})
return
}
// DO NOT expose secrets: respond with a public view of the order
public := OrderPublic{ID: order.ID, OwnerID: order.OwnerID}
c.JSON(http.StatusOK, public)
}