CVE-2026-86171: DefaultFuction CRM SQL Injection Flaw

CVE-2026-86171 Overview

CVE-2026-86171 is a SQL injection vulnerability in DefaultFuction Customer-Relationship-Management-System version 1.0.0. The flaw resides in the /modules/orders/delete.php script, where the ID parameter is passed directly into a database query without proper sanitization. Remote attackers with low-level authenticated access can manipulate the ID argument to inject arbitrary SQL statements. The exploit details have been publicly disclosed, increasing the risk of opportunistic exploitation against exposed installations. 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 in /modules/orders/delete.php, potentially exposing or modifying CRM data.

Affected Products

DefaultFuction Customer-Relationship-Management-System 1.0.0
Component: /modules/orders/delete.php
Parameter: ID

Discovery Timeline

2026-09-06 - CVE-2026-86171 published to NVD
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2026-86171

Vulnerability Analysis

The vulnerability affects the order deletion module of the DefaultFuction CRM application. When a user submits a delete request, the ID parameter received by /modules/orders/delete.php is concatenated into a SQL statement without parameterization or input validation. An authenticated attacker can substitute the ID value with crafted SQL syntax to alter the intended query semantics. This enables data extraction, unauthorized record modification, or deletion of arbitrary rows in the underlying database. Public disclosure of the technique lowers the barrier for exploitation attempts against internet-facing CRM deployments.

Root Cause

The root cause is the absence of prepared statements or input sanitization when handling the ID argument in the order deletion handler. Direct string concatenation into a SQL query allows attacker-controlled input to break out of the intended parameter context. This class of flaw is tracked under [CWE-74] and is a well-documented pattern in legacy PHP applications.

Attack Vector

Exploitation requires network access to the vulnerable endpoint and a valid low-privilege account within the CRM. The attacker sends a crafted HTTP request to /modules/orders/delete.php with a malicious ID value containing SQL metacharacters. Because the vector is network-based and the exploit is public, automated scanners can identify vulnerable instances rapidly. See the GitHub Issue Discussion and VulDB Vulnerability Report for further technical details.

Detection Methods for CVE-2026-86171

Indicators of Compromise

HTTP requests targeting /modules/orders/delete.php containing SQL metacharacters such as ', --, UNION, or SLEEP( in the ID parameter.
Unexpected database errors or extended response times originating from the orders module.
Anomalous DELETE or SELECT operations against CRM database tables outside normal business hours.

Detection Strategies

Deploy web application firewall (WAF) signatures that inspect the ID parameter of the orders delete endpoint for SQL injection payloads.
Enable database query logging and alert on syntactically abnormal queries generated by the CRM service account.
Correlate authentication logs with requests to /modules/orders/delete.php to identify low-privilege accounts abusing the endpoint.

Monitoring Recommendations

Monitor web server access logs for repeated requests to the orders delete endpoint from a single source.
Track outbound data volumes from the database host to identify potential exfiltration patterns.
Baseline normal delete operations per user and alert on statistical deviations.

How to Mitigate CVE-2026-86171

Immediate Actions Required

Restrict network access to the CRM application to trusted networks or place it behind a VPN until a patch is available.
Revoke or rotate credentials of accounts that do not require access to the orders module.
Deploy WAF rules that block SQL injection payloads targeting the ID parameter of /modules/orders/delete.php.

Patch Information

No vendor patch has been published in the referenced sources at the time of NVD publication. Track the project's GitHub Issue Discussion and the VulDB CVE-2026-86171 entry for remediation updates. Organizations should apply source-level fixes by replacing string concatenation in /modules/orders/delete.php with parameterized queries or prepared statements.

Workarounds

Implement a server-side allowlist that enforces integer-only values for the ID parameter before it reaches the database layer.
Apply the principle of least privilege to the database account used by the CRM, removing DELETE and UNION privileges where feasible.
Disable or remove the vulnerable orders delete module if the functionality is not required in the deployment.

bash

# Example nginx rule to block non-numeric ID values on the vulnerable endpoint
location = /modules/orders/delete.php {
    if ($arg_ID !~ "^[0-9]+$") {
        return 403;
    }
}