CVE-2026-14690: Multi-Vendor Grocery Auth Bypass Flaw

CVE-2026-14690 Overview

CVE-2026-14690 is an improper authorization vulnerability in SourceCodester Multi-Vendor Online Grocery Management System 1.0. The flaw resides in the save_users function of the classes/Users.php file. Remote attackers can manipulate the function to perform actions without proper authorization checks. The exploit has been publicly disclosed, increasing the likelihood of opportunistic attacks against exposed installations. The weakness maps to [CWE-266] Incorrect Privilege Assignment.

Critical Impact
Remote attackers can invoke the save_users function without authorization, allowing unauthorized creation or modification of user accounts in the grocery management system.

Affected Products

SourceCodester Multi-Vendor Online Grocery Management System 1.0
classes/Users.php component
save_users function

Discovery Timeline

2026-07-05 - CVE-2026-14690 published to NVD
2026-07-06 - Last updated in NVD database

Technical Details for CVE-2026-14690

Vulnerability Analysis

The vulnerability affects the save_users function in classes/Users.php, which handles user account creation and modification within the Multi-Vendor Online Grocery Management System. The function fails to enforce proper authorization checks before executing privileged operations. A remote attacker can send crafted requests to this endpoint without requiring valid administrative credentials.

Because the function processes user account data, exploitation can affect account integrity across the application. The attack requires no user interaction and can be launched over the network. Public availability of exploit details increases the exposure window for unpatched installations.

Root Cause

The root cause is missing or insufficient authorization enforcement in the save_users function. The application does not validate that the requesting user holds the privileges required to invoke account management operations. This maps directly to [CWE-266] Incorrect Privilege Assignment, where privilege boundaries are not correctly enforced at the application logic layer.

Attack Vector

Exploitation occurs over the network with low attack complexity and requires no authentication or user interaction. An attacker sends an HTTP request directly to the vulnerable endpoint that routes to save_users in classes/Users.php. Because authorization checks are absent or improperly implemented, the request executes with elevated effects on user account data. Consult the GitHub CVE Issue Tracking and VulDB entry for CVE-2026-14690 for technical details.

No verified proof-of-concept code is reproduced here. The vulnerability manifests when the save_users endpoint accepts and processes account data without validating the caller's role or session privileges.

Detection Methods for CVE-2026-14690

Indicators of Compromise

Unexpected HTTP POST requests targeting the save_users endpoint in classes/Users.php from unauthenticated sessions
Creation of new user or administrator accounts that do not correspond to legitimate administrative activity
Modifications to existing user records without corresponding audit trail entries from privileged sessions

Detection Strategies

Review web server access logs for requests reaching classes/Users.php with the save_users action from sources lacking valid administrator session cookies
Correlate account creation and modification events with the source IP, session identifier, and authenticated role of the requester
Deploy web application firewall rules to flag anonymous or low-privilege requests targeting user management endpoints

Monitoring Recommendations

Enable verbose application logging around user account CRUD operations and forward logs to a centralized SIEM
Monitor for anomalous spikes in new account registrations or role changes within the grocery management application
Alert on any successful HTTP 200 responses from save_users where the request lacks an authenticated administrator context

How to Mitigate CVE-2026-14690

Immediate Actions Required

Restrict network access to the Multi-Vendor Online Grocery Management System administration paths using firewall or reverse proxy allowlists
Audit all existing user accounts for unauthorized additions or privilege changes and remove suspect accounts
Add server-side authorization checks in save_users that verify the caller holds an administrator role before processing account data

Patch Information

No vendor patch is currently referenced in the NVD entry or the linked VulDB vulnerability record. Operators should apply source-level authorization fixes to classes/Users.php and monitor the SourceCodester project pages for updates.

Workarounds

Place the application behind an authenticated reverse proxy that enforces access control before requests reach classes/Users.php
Disable or remove the save_users endpoint if user self-service is not required in the deployment
Implement a web application firewall rule that rejects requests to user management endpoints lacking a valid administrator session token

bash

# Example nginx location block restricting access to the vulnerable endpoint
location ~* /classes/Users\.php {
    allow 10.0.0.0/8;      # internal admin network
    deny all;
    auth_basic "Admin Only";
    auth_basic_user_file /etc/nginx/.htpasswd;
}