CVE-2026-78656: Sales and Inventory System SQLi Vulnerability

CVE-2026-78656 Overview

CVE-2026-78656 is a SQL injection vulnerability in itsourcecode Sales and Inventory System 1.0. The flaw resides in the /pages/cust_del.php script, where the ID parameter is passed to a database query without proper sanitization. Remote attackers with low-privileged access can manipulate the ID argument to inject arbitrary SQL statements. The vulnerability maps to CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component. Public exploit details have been disclosed through VulDB and GitHub, increasing the likelihood of opportunistic exploitation against exposed deployments.

Critical Impact
Authenticated attackers can execute arbitrary SQL queries against the backend database, enabling data disclosure, tampering, or deletion of customer records handled by the Sales and Inventory System.

Affected Products

itsourcecode Sales and Inventory System 1.0
Vulnerable component: /pages/cust_del.php
Vulnerable parameter: ID

Discovery Timeline

2026-08-25 - CVE-2026-78656 published to NVD
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-78656

Vulnerability Analysis

The vulnerability exists in the customer deletion workflow of itsourcecode Sales and Inventory System 1.0. The cust_del.php endpoint accepts the ID parameter over HTTP and incorporates it into a SQL statement without parameterization or type enforcement. An attacker who can authenticate to the application, even with low-privileged credentials, can supply crafted ID values that alter the intended query structure. Successful injection results in limited confidentiality, integrity, and availability impact to the underlying database. The exploit technique has been made public, lowering the barrier to reproduction.

Root Cause

The root cause is improper neutralization of user-supplied input before it is concatenated into a SQL query. The cust_del.php handler treats the ID argument as trusted data and does not apply prepared statements, whitelisting, or input casting. This pattern falls under CWE-74, the injection weakness class covering SQL injection.

Attack Vector

Exploitation occurs remotely over the network against an authenticated session. The attacker issues an HTTP request to /pages/cust_del.php with a malicious ID value containing SQL metacharacters and injected clauses. The backend database then executes the attacker-controlled fragment as part of the delete query. Because the application processes the response server-side, error-based, boolean-based, and time-based extraction techniques are all viable. Technical write-ups are available through the VulDB CVE-2026-78656 entry and the GitHub Issue #28 Discussion.

Detection Methods for CVE-2026-78656

Indicators of Compromise

HTTP requests to /pages/cust_del.php containing SQL metacharacters in the ID parameter, such as single quotes, UNION, SLEEP(, --, or /* sequences.
Web server or PHP error logs referencing SQL syntax errors originating from cust_del.php.
Unexpected DELETE or SELECT statements in database audit logs tied to the customer table.
Anomalous outbound data volumes from the application host following requests to the vulnerable endpoint.

Detection Strategies

Deploy web application firewall signatures that inspect the ID query parameter on /pages/cust_del.php for SQL injection payloads.
Enable database query logging and alert on queries against the customer table that include tautologies such as OR 1=1 or stacked statements.
Correlate authentication events with subsequent requests to cust_del.php to identify low-privileged accounts probing delete functionality.

Monitoring Recommendations

Ingest web server access logs into a centralized analytics pipeline and baseline typical ID values, which should be numeric-only.
Monitor for repeated 500-status responses from cust_del.php, which often signal injection probing.
Track privileged database account activity for unusual schema enumeration queries such as reads against information_schema.

How to Mitigate CVE-2026-78656

Immediate Actions Required

Restrict network access to the Sales and Inventory System to trusted management networks until a fix is applied.
Disable or gate the /pages/cust_del.php endpoint at the reverse proxy if the customer deletion feature is not required.
Rotate credentials for any application or database accounts that may have been exposed if injection is suspected.
Review database audit logs for unauthorized customer record modifications or deletions.

Patch Information

No vendor patch has been referenced in the NVD entry at the time of publication. Administrators should monitor the IT Source Code Blog and the VulDB Vulnerability #394867 record for updates. Where source access is available, remediate by replacing dynamic query construction in cust_del.php with parameterized prepared statements and by casting the ID parameter to an integer before use.

Workarounds

Enforce strict server-side input validation that rejects any non-integer ID value at the application boundary.
Apply a WAF rule that blocks requests to /pages/cust_del.php when the ID parameter contains characters outside [0-9].
Run the backing database account with least privilege, removing DROP, ALTER, and cross-database read permissions from the application user.
Place the application behind an authenticated reverse proxy that limits access to a small set of operator IP addresses.

bash

# Example NGINX rule to reject non-numeric ID values on the vulnerable endpoint
location = /pages/cust_del.php {
    if ($arg_ID !~ ^[0-9]+$) {
        return 403;
    }
    proxy_pass http://sales_inventory_backend;
}