CVE-2026-86163: Sales and Inventory System SQLi Vulnerability

CVE-2026-86163 Overview

CVE-2026-86163 is a SQL injection vulnerability in itsourcecode Sales and Inventory System 1.0. The flaw resides in the /pages/pro_del.php script, where the ID parameter is passed to a database query without proper sanitization. Remote attackers with low-level authentication can manipulate the ID argument to inject arbitrary SQL statements. According to the advisory, exploit code is publicly available and may be used against exposed instances. The vulnerability is categorized under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact
Authenticated remote attackers can inject SQL statements through the ID parameter of pro_del.php, potentially reading, modifying, or deleting inventory and sales data stored in the backend database.

Affected Products

itsourcecode Sales and Inventory System 1.0
Component: /pages/pro_del.php
Vulnerable parameter: ID

Discovery Timeline

2026-09-06 - CVE-2026-86163 published to the National Vulnerability Database (NVD)
2026-09-08 - Last updated in NVD database
2026-09-11 - EPSS scoring assigned

Technical Details for CVE-2026-86163

Vulnerability Analysis

The vulnerability is a classic SQL injection issue affecting the delete-product workflow of the Sales and Inventory System. The pro_del.php endpoint accepts an ID value from the request and concatenates it directly into a SQL statement. Because the parameter is not validated, sanitized, or bound as a prepared statement parameter, an attacker can append additional SQL syntax to alter the meaning of the query.

Exploitation requires only network reachability to the affected application and a low-privilege account. Successful injection can be used to enumerate database schema, extract records from arbitrary tables, or destructively modify inventory and sales rows. The public availability of a proof-of-concept increases the likelihood of opportunistic attacks against internet-facing deployments.

Root Cause

The root cause is improper neutralization of user-supplied input before it is used in a SQL query. The pro_del.php handler treats the ID argument as trusted data and interpolates it into a query string rather than binding it as a parameter through a prepared statement or an ORM abstraction.

Attack Vector

An authenticated attacker issues a crafted HTTP request to /pages/pro_del.php with a malicious value in the ID parameter. The value contains SQL metacharacters and injected clauses that the backend database interprets as part of the original statement. Because the endpoint executes deletion logic, a successful payload can extend from data extraction into destructive database operations. Refer to the GitHub CVE Issue Discussion and the VulDB CVE-2026-86163 entry for additional technical context.

No verified exploit code is republished here. The vulnerability mechanism follows standard tautology and UNION-based SQL injection patterns against an unparameterized ID field.

Detection Methods for CVE-2026-86163

Indicators of Compromise

HTTP requests to /pages/pro_del.php containing SQL metacharacters in the ID parameter, such as single quotes, UNION, SELECT, SLEEP(, or comment sequences (--, #, /*).
Unexpected DELETE, SELECT from information_schema, or long-running queries originating from the application database user.
Web server logs showing repeated GET or POST requests to pro_del.php from a single source with varying ID values.

Detection Strategies

Deploy web application firewall (WAF) signatures that flag SQL injection patterns targeting the ID query parameter on pro_del.php.
Enable database query logging and alert on queries containing tautologies (OR 1=1), stacked statements, or references to information_schema from the application account.
Correlate authentication events with subsequent access to pro_del.php to identify low-privilege accounts probing the endpoint.

Monitoring Recommendations

Monitor outbound traffic from the application server for unusual volumes that could indicate data exfiltration following successful injection.
Track HTTP 500 responses and database errors returned by pro_del.php, which often accompany injection probing.
Baseline normal usage of the delete-product workflow and alert on request rates or parameter patterns that deviate from that baseline.

How to Mitigate CVE-2026-86163

Immediate Actions Required

Restrict network access to the Sales and Inventory System so that only trusted internal users can reach /pages/pro_del.php.
Revoke or rotate credentials for low-privilege accounts that are not required, since exploitation requires authentication.
Deploy WAF rules that block SQL metacharacters in the ID parameter of pro_del.php until a code-level fix is applied.
Review database audit logs for signs of unauthorized DELETE or SELECT activity against sales and inventory tables.

Patch Information

No vendor patch has been published in the referenced advisories at the time of writing. Administrators should monitor the IT Source Code Blog and the VulDB Vulnerability #399288 entry for updates. Where source code access is available, replace concatenated SQL in pro_del.php with parameterized queries or prepared statements, and enforce server-side validation that the ID value is a positive integer.

Workarounds

Apply an input filter at the application or reverse-proxy layer that rejects any ID value not matching the pattern ^[0-9]+$.
Grant the database account used by the application only the minimum privileges required, removing rights to information_schema and system tables where possible.
If the delete-product feature is not business-critical, disable the /pages/pro_del.php endpoint at the web server until a fix is deployed.

bash

# Example nginx location block to restrict and validate the ID parameter
location = /pages/pro_del.php {
    # Allow only internal admin network
    allow 10.0.0.0/24;
    deny all;

    # Reject non-numeric ID values before reaching PHP
    if ($arg_ID !~ "^[0-9]+$") {
        return 400;
    }

    include fastcgi_params;
    fastcgi_pass unix:/var/run/php-fpm.sock;
}