CVE-2026-88416: MCMS SQL Injection Vulnerability

CVE-2026-88416 Overview

CVE-2026-88416 is a SQL injection vulnerability affecting MCMS versions 6.1.1 through 6.2.1. The flaw resides in the custom model/form import feature of the content management system. Attackers can inject arbitrary SQL statements through the import functionality, allowing manipulation of database queries. Successful exploitation may lead to unauthorized data access, data modification, or further compromise of the underlying database server.

Critical Impact
Attackers with access to the custom model/form import feature can execute arbitrary SQL commands against the backing database, potentially exposing or modifying stored content and credentials.

Affected Products

MCMS 6.1.1
MCMS 6.2.0
MCMS 6.2.1

Discovery Timeline

2026-09-22 - CVE-2026-88416 published to the National Vulnerability Database
2026-09-22 - Last updated in NVD database

Technical Details for CVE-2026-88416

Vulnerability Analysis

The vulnerability is a SQL injection [CWE-89] flaw in the custom model/form import feature of MCMS. The import routine accepts attacker-controlled input and incorporates it into SQL statements without adequate sanitization or parameterization. This design allows an attacker to break out of the intended query context and execute additional statements.

The EPSS score for this issue is approximately 0.195%, indicating a low predicted probability of near-term exploitation. However, SQL injection vulnerabilities in content management systems are commonly targeted once public proof-of-concept material becomes available. Refer to the GitHub CVE Issue Discussion for additional context.

Root Cause

The root cause is improper neutralization of special elements used in SQL commands within the custom model/form import handler. User-supplied data from the import payload is concatenated into database queries rather than being bound as parameters. This pattern gives attackers direct influence over query structure.

Attack Vector

An attacker with the ability to submit an import payload to the affected feature can craft malicious input that alters the SQL executed by the application. Depending on deployment configuration, this may require authenticated access to the administrative import functionality. Exploitation does not require memory corruption primitives or complex chaining.

No verified public exploit code is available at this time. See the referenced GitHub discussion for technical details reported by the submitter.

Detection Methods for CVE-2026-88416

Indicators of Compromise

Unexpected import requests to the MCMS custom model or form endpoints containing SQL metacharacters such as single quotes, UNION, SELECT, or comment sequences like -- and /*.
Database error messages or stack traces in application logs originating from import-related request handlers.
Anomalous read or write activity against MCMS database tables shortly after import feature use.

Detection Strategies

Inspect web server and application logs for POST requests to custom model/form import endpoints containing SQL keywords or encoded payloads.
Enable database query logging and alert on unusual query patterns such as stacked statements or information_schema access originating from the MCMS application account.
Deploy a web application firewall with SQL injection signatures tuned for the MCMS admin interface.

Monitoring Recommendations

Monitor authentication events for the MCMS administrative interface and correlate with import feature usage.
Track outbound connections from the MCMS host that may indicate post-exploitation data exfiltration.
Review file uploads submitted to the import feature and retain them for forensic analysis.

How to Mitigate CVE-2026-88416

Immediate Actions Required

Restrict access to the MCMS administrative interface and custom model/form import feature to trusted networks and accounts only.
Audit recent use of the import feature across MCMS 6.1.1 through 6.2.1 deployments for signs of abuse.
Rotate credentials for the database account used by MCMS if compromise is suspected.

Patch Information

No vendor patch information is included in the NVD entry at the time of publication. Administrators should monitor the GitHub CVE Issue Discussion and the MCMS project for a fixed release addressing the SQL injection in the custom model/form import feature.

Workarounds

Disable the custom model/form import feature until a vendor patch is applied.
Place the MCMS administrative interface behind a VPN or IP allowlist to reduce exposure.
Deploy web application firewall rules that block SQL injection patterns targeting the import endpoint.
Apply least privilege to the database account used by MCMS, removing DDL and administrative permissions where not required.

bash

# Example: restrict MCMS admin interface to a management subnet using nginx
location /ms/ {
    allow 10.0.0.0/24;
    deny all;
    proxy_pass http://mcms_backend;
}