How to fix CVE-2025-6421?

Within 24 hours: Identify all systems running Simple Online Hotel Reservation System 1.0 and isolate the /admin/add_account.php endpoint from public internet access using network segmentation or WAF rules. Within 7 days: Implement input validation and parameterized query enforcement; consider disabling the admin account creation feature if not actively used. Within 30 days: Evaluate alternative hotel reservation platforms with active security support, or demand a patched version from the vendor with a firm timeline.

Is PHP affected by CVE-2025-6421?

A critical SQL injection vulnerability in the Simple Online Hotel Reservation System v1.0 allows remote attackers to compromise the admin account creation functionality without authentication.

CVE-2025-6421

EUVD-2025-18876 HIGH

2025-06-21 [email protected]

7.3

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 15, 2026 - 21:35 vuln.today

EUVD ID Assigned

Mar 15, 2026 - 21:35 euvd

EUVD-2025-18876

PoC Detected

Oct 23, 2025 - 20:06 vuln.today

Public exploit code

CVE Published

Jun 21, 2025 - 22:15 nvd

HIGH 7.3

Description

A vulnerability was found in code-projects Simple Online Hotel Reservation System 1.0. It has been rated as critical. This issue affects some unknown processing of the file /admin/add_account.php. The manipulation of the argument name/admin_id leads to sql injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Analysis

A critical SQL injection vulnerability exists in code-projects Simple Online Hotel Reservation System version 1.0, specifically in the /admin/add_account.php file where the 'name' or 'admin_id' parameters are not properly sanitized. An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary SQL commands, potentially leading to unauthorized data access, modification, or deletion of the hotel reservation database. Public exploit code is available and the vulnerability is actively being disclosed, increasing exploitation risk in the wild.

Technical Context

The vulnerability is a classic SQL injection (CWE-74: Improper Neutralization of Special Elements used in an SQL Command) vulnerability in a PHP-based web application. The /admin/add_account.php endpoint fails to properly validate or parameterize SQL queries before incorporating user-supplied input from the 'name' or 'admin_id' parameters. The affected software is code-projects Simple Online Hotel Reservation System 1.0 (likely CPE: cpe:2.3:a:code-projects:simple_online_hotel_reservation_system:1.0:*:*:*:*:*:*:*). The vulnerability stems from inadequate input validation and likely missing prepared statements or parameterized queries in the PHP backend, allowing attackers to break out of intended SQL context and inject malicious SQL syntax.

Affected Products

- vendor: code-projects; product: Simple Online Hotel Reservation System; versions: ['1.0']; affected_components: ['/admin/add_account.php']; vulnerable_parameters: ['name', 'admin_id']; cpe: cpe:2.3:a:code-projects:simple_online_hotel_reservation_system:1.0:*:*:*:*:*:*:*

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.1

CVSS: +36

POC: +20

CVE-2025-6421 vulnerability details – vuln.today

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CVE-2025-6421

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CVE-2025-6421

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