Overview
The CVE-2026-44349 case shows how an injection flaw in a Go-based GraphQL/JSON-API headless CMS can lead to full data exposure. Prior to patch 0.11.5, Daptin constructed fuzzy search queries by splitting a user-supplied column list (via the API endpoint) and directly interpolating those column names into raw SQL fragments. This allowed an authenticated user to influence the SQL in ways that bypassed proper access controls, effectively reading any table they could reference through the query. The vulnerability arises because the server did not whitelist or validate the column names before injecting them into the query, enabling arbitrary SQL-like expressions when combined with LIKE patterns. The end result is heightened risk of data leakage across the database, not just within a single entity, and it underscores a broader class of CWE-89 SQL injection flaws in Go (Gin) services that concatenate user input into SQL without strict whitelisting. The issue was flagged as CWE-89 and patched in version 0.11.5 of Daptin, but it serves as a stark reminder for any Go (Gin) service that builds dynamic SQL from user input. More generally, injection vulnerabilities in Go apps often surface when developers mix user-provided identifiers (like column names or table hints) with SQL strings or pass them into builders without validating against a safe, predefined set of values.
In Go (Gin) contexts, this vulnerability manifests when code uses string interpolation or raw SQL fragments that incorporate user-controlled column names. Even when using libraries like goqu, if the column identifiers are derived from user input and not validated, an attacker can alter the structure of the query or cause unintended behavior. The core remediation pattern is to avoid incorporating user-supplied identifiers directly into SQL and instead enforce a strict allowlist of columns, combined with parameterized queries for user-provided values. After applying a proper whitelist, the query can be built in a safe, parameterized way (e.g., using placeholders for values while keeping column references constant for the allowed set). This approach aligns with the intent of mitigating CWE-89 and prevents the kind of data leakage demonstrated by CVE-2026-44349.
Affected Versions
All versions before 0.11.5 (0.11.0-0.11.4)
Code Fix Example
Go (Gin) API Security Remediation
// Vulnerable pattern (Go with Gin) and a fixed pattern side-by-side for clarity
// This illustration focuses on query construction rather than full HTTP handlers or DB wiring.
package main
import (
"fmt"
"strings"
)
// Vulnerable: user controls column names that get interpolated into SQL
func vulnerableQuery(entity string, column string, term string) string {
// column can be a comma-separated list supplied by the user
var parts []string
for _, c := range strings.Split(column, ",") {
c = strings.TrimSpace(c)
if c == "" {
continue
}
// Direct interpolation of user input into SQL (unsafe)
parts = append(parts, fmt.Sprintf("LOWER(%s) LIKE ?", c))
}
where := strings.Join(parts, " OR ")
return fmt.Sprintf("SELECT * FROM %s WHERE %s", entity, where)
}
// Fixed: whitelist allowed columns, build SQL with placeholders for values
func fixedQuery(entity string, column string, term string) (string, []interface{}) {
allowed := map[string]bool{
"name": true,
"description": true,
"email": true,
}
var whitelist []string
for _, c := range strings.Split(column, ",") {
c = strings.TrimSpace(c)
if allowed[c] {
whitelist = append(whitelist, c)
}
}
if len(whitelist) == 0 {
return "", nil
}
var parts []string
var args []interface{}
for _, c := range whitelist {
parts = append(parts, fmt.Sprintf("LOWER(%s) LIKE ?", c))
args = append(args, "%"+strings.ToLower(term)+"%")
}
where := strings.Join(parts, " OR ")
q := fmt.Sprintf("SELECT * FROM %s WHERE %s", entity, where)
return q, args
}
func main() {
// Demonstration (not a running server)
entity := "items"
userColumn := "name,description" // from user input
userTerm := "test"
// Vulnerable path
vuln := vulnerableQuery(entity, userColumn, userTerm)
fmt.Println("VULNERABLE QUERY:", vuln)
// Fixed path
q, args := fixedQuery(entity, userColumn, userTerm)
fmt.Println("FIXED QUERY:", q)
fmt.Println("ARGS:", args)
}