Overview
Broken Object Level Authorization (BOLOA) vulnerabilities occur when an app fails to enforce per-resource permissions, allowing an attacker with broad or organizational-level access to perform actions on specific resources owned by other users. The CVE-2026-44380 example from MISP demonstrates this: prior to 2.5.37, an authenticated organization administrator could reset authentication keys for site administrator accounts within the same organization because the flow did not explicitly prevent access to higher-privilege targets. Although MISP is not implemented in Go, the underlying flaw-incorrect authorization checks that permit cross-privilege operations-maps directly to Go services built with Gin. In such cases, an org admin might reset a site admin key if the target shares the same org, enabling privilege escalation. This is classified under CWE-863 (Incorrect Authorization). The fix is to enforce per-resource authorization rules, not just coarse role or org membership, and to clearly separate permissions between roles so high-privilege accounts cannot be manipulated by lower-privilege actors within the same organization.
Affected Versions
Prior to 2.5.37
Code Fix Example
Go (Gin) API Security Remediation
VULNERABLE:
package main
import (
"net/http"
"github.com/gin-gonic/gin"
)
type User struct {
ID string
OrgID string
Role string // e.g., "OrgAdmin", "SiteAdmin", "SystemAdmin"
Key string
}
var users = map[string]*User{
"u1": {ID: "u1", OrgID: "org1", Role: "SiteAdmin", Key: "orig-site"},
"u2": {ID: "u2", OrgID: "org1", Role: "OrgAdmin", Key: "orig-org"},
"u3": {ID: "u3", OrgID: "org2", Role: "SiteAdmin", Key: "orig-site2"},
}
func getUserFromHeader(c *gin.Context) *User {
id := c.GetHeader("X-User-Id")
if u, ok := users[id]; ok {
return u
}
return nil
}
func generateKey() string {
// simplistic placeholder for demonstration
return "new-key-" + RandStringRunes(8)
}
func vulnerableResetAuthKey(c *gin.Context) {
requester := getUserFromHeader(c)
targetID := c.Param("id")
target := users[targetID]
if requester == nil || target == nil {
c.Status(http.StatusBadRequest)
return
}
// VULNERABLE CHECK: only ensures same OrgID; no per-role protection
if requester.OrgID != target.OrgID {
c.Status(http.StatusForbidden)
return
}
// No check on target.Role; any admin in the same org can reset keys for any target
target.Key = generateKey()
c.JSON(http.StatusOK, gin.H{"target_id": target.ID, "new_key": target.Key})
}
func main() {
r := gin.Default()
r.POST("/vulnerable/users/:id/reset-key", vulnerableResetAuthKey)
// The fixed handler is shown in the FIX section below
r.Run(":8080")
}
FIX:
package main
import (
"net/http"
"github.com/gin-gonic/gin"
)
type User struct {
ID string
OrgID string
Role string // e.g., "OrgAdmin", "SiteAdmin", "SystemAdmin"
Key string
}
var users = map[string]*User{
"u1": {ID: "u1", OrgID: "org1", Role: "SiteAdmin", Key: "orig-site"},
"u2": {ID: "u2", OrgID: "org1", Role: "OrgAdmin", Key: "orig-org"},
"u3": {ID: "u3", OrgID: "org2", Role: "SiteAdmin", Key: "orig-site2"},
}
func getUserFromHeader(c *gin.Context) *User {
id := c.GetHeader("X-User-Id")
if u, ok := users[id]; ok {
return u
}
return nil
}
func generateKey() string {
return "new-key-" + RandStringRunes(8)
}
func fixedResetAuthKey(c *gin.Context) {
requester := getUserFromHeader(c)
targetID := c.Param("id")
target := users[targetID]
if requester == nil || target == nil {
c.Status(http.StatusBadRequest)
return
}
// FIX: enforce per-resource authorization
// If the target is a SiteAdmin, only SystemAdmin can reset
if target.Role == "SiteAdmin" && requester.Role != "SystemAdmin" {
c.Status(http.StatusForbidden)
return
}
// Also enforce org scoping
if requester.OrgID != target.OrgID {
c.Status(http.StatusForbidden)
return
}
target.Key = generateKey()
c.JSON(http.StatusOK, gin.H{"target_id": target.ID, "new_key": target.Key})
}
func main() {
r := gin.Default()
r.POST("/fixed/users/:id/reset-key", fixedResetAuthKey)
r.Run(":8080")
}
// Helpers
import (
"math/rand"
"time"
)
func RandStringRunes(n int) string {
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
b := make([]rune, n)
for i := range b {
b[i] = letterRunes[rand.Intn(len(letterRunes))]
}
return string(b)
}
func init() {
rand.Seed(time.Now().UnixNano())
}