CVE-2026-6183: Simple CMS 1.0 SQL Injection Vulnerability

CVE-2026-6183 Overview

CVE-2026-6183 is a SQL injection vulnerability in code-projects Simple Content Management System 1.0. The flaw resides in the /web/index.php file, where the ID parameter is passed to a database query without proper sanitization. An unauthenticated remote attacker can manipulate the ID argument to inject arbitrary SQL statements. A public exploit has been released, increasing the likelihood of opportunistic attacks against exposed deployments. The weakness is tracked under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact

Unauthenticated remote attackers can inject SQL commands through the ID parameter of /web/index.php, exposing database contents and potentially compromising application integrity.

Affected Products

• code-projects Simple Content Management System 1.0
• Deployments exposing the /web/index.php endpoint
• Web stacks running the vulnerable CMS without input validation patches

Discovery Timeline

• 2026-04-13 - CVE-2026-6183 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-6183

Vulnerability Analysis

The vulnerability affects the request handling logic in /web/index.php. The script accepts an ID parameter from the HTTP request and incorporates the value directly into a SQL statement. Because the application does not sanitize, validate, or parameterize this input, an attacker can append SQL syntax to the parameter value. The injected payload is interpreted by the database engine alongside the original query. Public proof-of-concept material is available, which lowers the technical barrier for exploitation. Attackers commonly leverage this class of flaw for data extraction using UNION SELECT payloads or boolean-based blind techniques. Successful exploitation does not require authentication or user interaction.

Root Cause

The root cause is improper neutralization of user-supplied input before use in a SQL query. The ID parameter is concatenated into a database statement rather than being bound through a prepared statement or escaped through a database-aware sanitization routine. This pattern allows attacker-controlled syntax to break out of the intended query context.

Attack Vector

The attack is delivered over the network via HTTP. An attacker crafts a request to /web/index.php with a malicious ID parameter value containing SQL metacharacters and query fragments. The vulnerable backend executes the resulting statement, returning data or modifying database state based on the injected payload. According to public references, the exploit has been disclosed and may be used in active attacks. Technical details are documented in the GitHub SQLi Vulnerability writeup and the VulDB Vulnerability #357106 entry.

No verified exploit code is reproduced here. Refer to the linked references for technical details on the payload structure.

Detection Methods for CVE-2026-6183

Indicators of Compromise

• HTTP requests to /web/index.php containing SQL metacharacters in the ID parameter such as ', --, UNION, SELECT, or OR 1=1
• Unexpected database errors in web server or application logs tied to the index.php endpoint
• Anomalous outbound data volumes from the database server following requests to the CMS

Detection Strategies

• Deploy web application firewall (WAF) signatures that flag SQL injection patterns against query string parameters
• Enable database query logging and alert on queries containing concatenated string literals from the ID parameter
• Correlate web access logs with database error logs to identify probing activity against /web/index.php

Monitoring Recommendations

• Monitor for high-frequency requests to index.php with varying ID values, indicating automated injection tooling
• Track authentication failures and large SELECT result sets returned to anonymous sessions
• Inspect HTTP 500 responses originating from the CMS as potential indicators of failed injection attempts

How to Mitigate CVE-2026-6183

Immediate Actions Required

• Restrict public access to /web/index.php until a vendor fix is applied, using network controls or authentication proxies
• Deploy a WAF rule that rejects requests containing SQL syntax in the ID parameter
• Audit database accounts used by the CMS and enforce least privilege to limit injection impact

Patch Information

No official vendor patch has been published in the referenced advisories at the time of disclosure. Operators should monitor the code-projects vendor site and the VulDB entry for #357106 for updates. Where source access is available, replace string concatenation in index.php with parameterized queries using PDO or mysqli prepared statements.

Workarounds

• Implement input validation that restricts the ID parameter to numeric values only before passing it to the database layer
• Apply a WAF or reverse proxy rule that blocks payloads matching SQL injection signatures
• Remove or disable the affected endpoint if the CMS is not in active use

# Example nginx configuration to block SQL metacharacters in the ID parameter
location /web/index.php {
    if ($arg_id ~* "('|--|;|union|select|or\s+1=1)") {
        return 403;
    }
}