CVE-2026-90600: Sales and Inventory System SQL Injection

CVE-2026-90600 is a SQL injection vulnerability in itsourcecode Sales and Inventory System 1.0 affecting the inv_edit1.php file. Attackers can exploit the ID parameter remotely to execute malicious SQL queries. This article covers technical details, affected versions, impact assessment, and mitigation strategies.

CVE-2026-90600 Overview

CVE-2026-90600 is a SQL injection vulnerability in itsourcecode Sales and Inventory System 1.0. The flaw resides in the /pages/inv_edit1.php script, where the ID parameter is passed directly into a database query without proper sanitization. Remote attackers with low privileges can manipulate this parameter to inject arbitrary SQL statements. The exploit details have been publicly disclosed, increasing exposure risk for affected deployments. The vulnerability is classified under CWE-74: Improper Neutralization of Special Elements in Output.

Critical Impact
Authenticated remote attackers can inject SQL statements through the ID parameter of inv_edit1.php, potentially exposing or altering inventory and sales records stored in the backend database.

Affected Products

itsourcecode Sales and Inventory System 1.0
Deployments exposing /pages/inv_edit1.php to network-reachable users
Downstream forks or customizations reusing the vulnerable inv_edit1.php handler

Discovery Timeline

2026-09-13 - CVE-2026-90600 published to NVD
2026-09-15 - Last updated in NVD database

Technical Details for CVE-2026-90600

Vulnerability Analysis

The vulnerability exists in the inv_edit1.php endpoint of the Sales and Inventory System. The ID argument, supplied via HTTP request, is concatenated into a SQL query without parameterization or input validation. This allows an attacker to break out of the intended query context and append additional SQL clauses.

Exploitation requires network access and low-privilege authentication. Because the vulnerable endpoint interacts with the inventory database, successful injection can expose sensitive records, modify stored data, or enumerate database structure through UNION-based or error-based techniques. Public disclosure of exploit details lowers the barrier for opportunistic attackers to weaponize the flaw.

Root Cause

The root cause is improper neutralization of user-supplied input before it is used in a SQL statement [CWE-74]. The inv_edit1.php handler trusts the ID parameter and interpolates it directly into the query string. No prepared statements, parameter binding, or type coercion is applied to enforce that ID remains a numeric identifier.

Attack Vector

An attacker sends a crafted HTTP request to /pages/inv_edit1.php with a malicious ID value containing SQL metacharacters. Because the parameter is interpolated into the query, injected clauses execute against the backend database. The attack can be performed remotely across the network with minimal complexity. Technical details are referenced in the GitHub Issue Tracker and the VulDB CVE-2026-90600 entry.

No verified proof-of-concept code is republished here. See the linked references for reproduction details.

Detection Methods for CVE-2026-90600

Indicators of Compromise

HTTP requests to /pages/inv_edit1.php containing SQL metacharacters such as single quotes, UNION SELECT, --, /*, or OR 1=1 in the ID parameter.
Unusually long or URL-encoded ID values in web server access logs pointing to inv_edit1.php.
Database error messages returned to clients referencing SQL syntax faults tied to inventory queries.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the ID query parameter for known SQL injection payloads.
Correlate database audit logs with web access logs to identify anomalous query patterns originating from the inventory edit workflow.
Alert on any query executed by the application's database user that references system tables such as information_schema when initiated from inv_edit1.php.

Monitoring Recommendations

Enable verbose HTTP logging for the /pages/ directory and retain logs for retrospective analysis.
Monitor for authentication events followed by rapid, repeated requests to inv_edit1.php from a single source.
Track outbound network connections from the database host that could indicate exfiltration attempts following successful injection.

How to Mitigate CVE-2026-90600

Immediate Actions Required

Restrict network access to the Sales and Inventory System to trusted users and internal networks only.
Audit application accounts and revoke unnecessary access to the inv_edit1.php workflow.
Review database logs for suspicious queries against inventory tables since deployment.

Patch Information

No vendor patch has been published for CVE-2026-90600 at the time of this writing. Organizations running itsourcecode Sales and Inventory System 1.0 should monitor the IT Source Code Resource and the VulDB Vulnerability #403182 entry for updates. In the absence of an official fix, developers maintaining forks should modify inv_edit1.php to use parameterized queries and enforce numeric validation on the ID parameter.

Workarounds

Place the application behind a WAF configured with SQL injection signatures targeting the ID parameter of inv_edit1.php.
Enforce input validation at a reverse proxy by rejecting non-numeric values for ID before requests reach the application.
Reduce database user privileges so the application account cannot read system schemas or write outside required tables.
Take the application offline if it is not business-critical until a patched version is available.

bash

# Example nginx snippet: reject non-numeric ID values before they reach inv_edit1.php
location /pages/inv_edit1.php {
    if ($arg_id !~ "^[0-9]+$") {
        return 400;
    }
    proxy_pass http://backend;
}