CVE-2026-90597: itsourcecode Sales System SQL Injection

CVE-2026-90597 Overview

CVE-2026-90597 is a SQL injection vulnerability in itsourcecode Sales and Inventory System version 1.0. The flaw resides in the /pages/sup_edit1.php file, where the ID parameter is passed to a backend database query without proper sanitization. Remote attackers with low-level privileges can manipulate the ID argument to inject arbitrary SQL statements. The issue is classified under [CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)]. Public disclosure of the exploit technique increases the likelihood of opportunistic scanning and exploitation against exposed installations.

Critical Impact
Authenticated remote attackers can inject SQL statements through the ID parameter of sup_edit1.php, potentially exposing or altering supplier and inventory records stored in the backing database.

Affected Products

itsourcecode Sales and Inventory System 1.0
Component: /pages/sup_edit1.php
Vulnerable parameter: ID

Discovery Timeline

2026-09-13 - CVE-2026-90597 published to NVD
2026-09-14 - Last updated in NVD database

Technical Details for CVE-2026-90597

Vulnerability Analysis

The vulnerability affects the supplier edit workflow inside itsourcecode Sales and Inventory System 1.0. When a user accesses /pages/sup_edit1.php, the application accepts the ID request parameter and concatenates it into a SQL query used to load supplier records. Because the parameter is not validated, escaped, or bound as a prepared statement, attacker-controlled SQL fragments alter the query executed against the database. Successful exploitation yields limited but meaningful confidentiality, integrity, and availability impact, including unauthorized data reads, modification of supplier records, and error-based information disclosure. Public exploit details are referenced in the VulDB CVE Record and a related GitHub Issue Discussion.

Root Cause

The root cause is missing input validation and the use of dynamic SQL string concatenation for the ID argument in /pages/sup_edit1.php. The application trusts request input without enforcing parameterized queries or type coercion, allowing SQL metacharacters to reach the query engine.

Attack Vector

Exploitation requires network access to the web application and a low-privileged authenticated session. An attacker submits a crafted ID value—typically through GET or POST parameters handled by sup_edit1.php—to inject clauses such as UNION SELECT payloads or boolean-based conditions. No user interaction is required beyond the attacker's own request.

Because no verified proof-of-concept code is published in the enriched dataset, refer to the VulDB Vulnerability Record for public technical detail on the injection pattern.

Detection Methods for CVE-2026-90597

Indicators of Compromise

HTTP requests to /pages/sup_edit1.php where the ID parameter contains SQL metacharacters such as single quotes, UNION, SELECT, --, or /*.
Database error messages returned to clients referencing supplier queries, indicating error-based injection attempts.
Anomalous supplier record modifications or reads not tied to legitimate administrative activity.

Detection Strategies

Enable web server access logging and search for suspicious query strings targeting sup_edit1.php.
Deploy a web application firewall (WAF) with SQL injection signatures tuned for the ID parameter path.
Correlate application-tier logs with database audit logs to identify queries with unexpected clauses originating from the supplier edit endpoint.

Monitoring Recommendations

Alert on repeated 4xx or 5xx responses from /pages/sup_edit1.php that may signal injection probing.
Track authenticated sessions that issue high volumes of requests to supplier edit endpoints within short time windows.
Monitor database processes for long-running or unusual SELECT statements referencing supplier tables.

How to Mitigate CVE-2026-90597

Immediate Actions Required

Restrict network exposure of the Sales and Inventory System 1.0 application to trusted networks or VPN users until a vendor fix is available.
Audit authenticated accounts and remove or rotate credentials for accounts that do not require access to the supplier edit workflow.
Enable WAF rules that block SQL metacharacters in the ID parameter of sup_edit1.php.

Patch Information

No vendor-supplied patch is referenced in the enriched CVE data. Consult the IT Source Code Homepage for vendor updates and the VulDB Submission Page for tracking status.

Workarounds

Modify /pages/sup_edit1.php to cast the ID parameter to an integer before use, rejecting non-numeric input.
Replace dynamic query construction with parameterized queries or PDO prepared statements bound to typed parameters.
Apply least-privilege database accounts so the web application user cannot alter schema or read unrelated tables.
Disable verbose SQL error output in the PHP configuration to prevent error-based data leakage.

bash

# Example WAF rule (ModSecurity) restricting the ID parameter to digits only
SecRule ARGS:ID "!@rx ^[0-9]+$" \
    "id:1090597,phase:2,deny,status:400,\
     msg:'CVE-2026-90597 - Non-numeric ID parameter to sup_edit1.php blocked'"