CVE-2026-4836: Accounting System 1.0 SQLi Vulnerability

CVE-2026-4836 Overview

A SQL injection vulnerability has been identified in code-projects Accounting System 1.0. The vulnerability exists in the /my_account/delete.php file where the cos_id parameter is improperly handled. An attacker can manipulate this parameter to inject malicious SQL queries, potentially gaining unauthorized access to the database. The vulnerability is exploitable remotely and requires low privileges to execute. A public exploit has been disclosed, increasing the risk of active exploitation.

Critical Impact
Remote attackers with low-level privileges can exploit this time-based blind SQL injection vulnerability to extract sensitive data, modify database records, or potentially compromise the entire accounting system.

Affected Products

code-projects Accounting System 1.0
PHP-based Accounting System deployments using vulnerable /my_account/delete.php endpoint

Discovery Timeline

2026-03-26 - CVE-2026-4836 published to NVD
2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-4836

Vulnerability Analysis

This vulnerability is classified as SQL Injection (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component). The affected component is the /my_account/delete.php file in the code-projects Accounting System, which processes the cos_id parameter without adequate input validation or sanitization.

The time-based blind SQL injection technique allows attackers to extract information from the database by observing response time delays. When malicious SQL statements are injected through the cos_id parameter, the database processes them as legitimate queries, enabling data exfiltration or manipulation without direct output visibility.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize user-supplied input before incorporating it into SQL queries. The cos_id parameter in the delete functionality is directly concatenated or interpolated into SQL statements without using parameterized queries or prepared statements. This allows attackers to break out of the intended query structure and execute arbitrary SQL commands.

Attack Vector

The attack can be initiated remotely over the network. An authenticated attacker with low privileges can exploit this vulnerability by sending crafted HTTP requests to the /my_account/delete.php endpoint with malicious SQL payloads in the cos_id parameter. The time-based blind nature of this injection means the attacker uses conditional time delays (such as SLEEP() or BENCHMARK() functions) to infer database contents character by character.

The vulnerability mechanism involves injecting SQL statements through the cos_id parameter that cause deliberate delays in database responses when certain conditions are true. By measuring these delays, attackers can extract sensitive information including usernames, passwords, and financial data stored in the accounting system. For detailed technical analysis, see the GitHub CVE Analysis.

Detection Methods for CVE-2026-4836

Indicators of Compromise

Unusual HTTP requests to /my_account/delete.php containing SQL syntax or special characters in the cos_id parameter
Database logs showing slow queries or queries containing SLEEP(), BENCHMARK(), or WAITFOR DELAY statements
Multiple sequential requests to the delete endpoint with incrementally varying payloads
Abnormal response time patterns indicating time-based extraction attempts

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in request parameters
Monitor application logs for requests containing SQL keywords such as UNION, SELECT, SLEEP, OR 1=1 in the cos_id parameter
Deploy database activity monitoring to alert on unusual query patterns or execution times
Enable detailed logging for the /my_account/delete.php endpoint to capture all parameter values

Monitoring Recommendations

Configure alerting for database queries with execution times exceeding normal thresholds
Set up real-time monitoring for repeated failed or anomalous requests to account management endpoints
Review access logs regularly for patterns consistent with automated SQL injection tools like SQLMap
Implement behavioral analysis to detect deviation from normal user activity patterns

How to Mitigate CVE-2026-4836

Immediate Actions Required

Disable or restrict access to the /my_account/delete.php endpoint until a patch is applied
Implement input validation to allow only numeric values for the cos_id parameter
Deploy a Web Application Firewall with SQL injection protection rules
Review database user permissions to ensure the application uses least-privilege access
Audit database logs for evidence of prior exploitation attempts

Patch Information

No official vendor patch has been released at this time. Organizations using code-projects Accounting System 1.0 should implement the workarounds listed below and monitor for updates from the vendor. Additional information may be available at the Code Projects Resource page or through the VulDB #353140 advisory.

Workarounds

Modify the source code to use parameterized queries or prepared statements for all database interactions involving the cos_id parameter
Implement server-side input validation to reject non-integer values in the cos_id parameter
Add rate limiting to the /my_account/delete.php endpoint to slow automated exploitation attempts
Restrict access to the vulnerable endpoint through network-level controls or authentication requirements

bash

# Example: Restrict access to vulnerable endpoint via .htaccess
<Files "delete.php">
    Order Deny,Allow
    Deny from all
    # Allow only trusted IP addresses
    Allow from 192.168.1.0/24
</Files>