CVE-2026-86172: DefaultFunction CRM SQLi Vulnerability

CVE-2026-86172 Overview

CVE-2026-86172 is a SQL injection vulnerability in DefaultFuction Customer Relationship Management System version 1.0.0. The flaw resides in /modules/customers/delete.php, where the ID parameter is passed to a database query without proper sanitization. An authenticated remote attacker can manipulate the ID argument to inject arbitrary SQL statements. The exploit has been disclosed publicly, increasing the likelihood of opportunistic abuse against exposed installations. The vulnerability is categorized under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact
A remote attacker with low-privilege access can inject SQL statements through the ID parameter of the customer deletion endpoint, potentially reading or modifying CRM database records.

Affected Products

DefaultFuction Customer Relationship Management System 1.0.0
Component: /modules/customers/delete.php
Vulnerable parameter: ID

Discovery Timeline

2026-09-06 - CVE-2026-86172 published to NVD
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2026-86172

Vulnerability Analysis

The vulnerability exists in the customer deletion workflow of DefaultFuction CRM 1.0.0. The delete.php script accepts the ID parameter from an HTTP request and incorporates it into a SQL statement without parameterized queries or input validation. This allows an attacker to break out of the intended query context and append additional SQL clauses.

Because the flaw is reachable over the network and requires only low-level authentication, any user with valid CRM credentials can trigger the injection. The disclosed proof of concept is referenced in the GitHub Issue Discussion and cataloged in the VulDB CVE Database Entry.

Root Cause

The root cause is improper neutralization of the ID argument before it is concatenated into a SQL query string. The application does not use prepared statements or type-cast the identifier to an integer. This design permits SQL metacharacters to alter query structure at runtime.

Attack Vector

An attacker sends a crafted HTTP request to /modules/customers/delete.php with a malicious payload in the ID parameter. Successful exploitation can result in unauthorized data retrieval, tampering with customer records, or manipulation of database contents depending on the database user's privileges. Refer to the VulDB Vulnerability Details for additional technical context.

No verified exploit code is republished here; consult the linked references for the public proof of concept.

Detection Methods for CVE-2026-86172

Indicators of Compromise

Requests to /modules/customers/delete.php containing SQL metacharacters such as ', --, UNION, SELECT, or SLEEP( in the ID parameter.
Unexpected deletion of customer records or anomalous rows appearing in CRM audit tables.
Database error messages or HTTP 500 responses correlated with requests to the delete endpoint.

Detection Strategies

Deploy web application firewall (WAF) signatures that inspect query and body parameters for SQL injection patterns targeting the ID parameter.
Enable database query logging and alert on multi-statement queries originating from the CRM application user.
Review authentication logs to correlate low-privileged CRM sessions with suspicious delete.php activity.

Monitoring Recommendations

Monitor outbound network traffic from the CRM host for signs of data exfiltration following suspicious requests.
Track request rates to /modules/customers/ endpoints and flag deviations from baseline behavior.
Ingest web server, application, and database logs into a centralized analytics platform for correlation and retention.

How to Mitigate CVE-2026-86172

Immediate Actions Required

Restrict network access to the DefaultFuction CRM instance to trusted users through VPN or IP allow-listing.
Rotate CRM user credentials and audit accounts with access to the customer management module.
Deploy WAF rules that block SQL injection patterns targeting the ID parameter in /modules/customers/delete.php.

Patch Information

No vendor patch has been referenced in the available advisory data at the time of publication. Track the upstream project through the GitHub Issue Discussion for remediation updates and apply any released fix as soon as it becomes available.

Workarounds

Enforce server-side input validation to require the ID parameter to be a numeric integer before use.
Refactor the query in delete.php to use prepared statements with bound parameters via PDO or MySQLi.
Apply the principle of least privilege to the database account used by the CRM, restricting DELETE and schema-modifying rights where feasible.

bash

# Example: block non-numeric ID values at the reverse proxy (nginx)
location /modules/customers/delete.php {
    if ($arg_ID !~ "^[0-9]+$") {
        return 400;
    }
}