CVE-2026-10258: itsourcecode CMS SQL Injection Flaw

CVE-2026-10258 Overview

CVE-2026-10258 is a SQL injection vulnerability in itsourcecode Content Management System 1.0. The flaw resides in the /admin/add_sub_topic.php script, where the topic_id parameter is passed to a database query without proper sanitization. An authenticated attacker with low privileges can manipulate this parameter to inject arbitrary SQL statements. The issue is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). Public exploit details have been disclosed through VulDB and a GitHub issue report, increasing the likelihood of opportunistic exploitation against exposed installations.

Critical Impact
Remote authenticated attackers can inject SQL queries through the topic_id parameter, enabling unauthorized data access, modification, or deletion within the CMS database.

Affected Products

itsourcecode Content Management System 1.0
The /admin/add_sub_topic.php administrative endpoint
Deployments exposing the admin interface to untrusted networks

Discovery Timeline

2026-06-01 - CVE-2026-10258 published to NVD
2026-06-01 - Last updated in NVD database

Technical Details for CVE-2026-10258

Vulnerability Analysis

The vulnerability exists in the administrative module of itsourcecode Content Management System 1.0. The /admin/add_sub_topic.php script accepts the topic_id HTTP parameter and concatenates it directly into a SQL statement. Because the application does not validate, sanitize, or parameterize this input, attackers can append SQL syntax that the database engine executes as part of the original query.

Exploitation requires network access to the admin panel and a low-privilege authenticated session. Successful injection grants the attacker the ability to read, modify, or delete records that the underlying database user can reach. Depending on database privileges, an attacker may also enumerate schema information or pivot toward stored credentials.

The weakness maps to [CWE-74] and reflects a classic failure to separate code from data in dynamically constructed SQL. Public proof-of-concept information is available through the linked VulDB CVE-2026-10258 entry and the GitHub Issue Report.

Root Cause

The root cause is unsanitized handling of the topic_id request parameter inside /admin/add_sub_topic.php. The script builds SQL statements through string concatenation rather than using prepared statements or parameterized queries. As a result, syntax tokens supplied by an attacker alter the structure of the query.

Attack Vector

An attacker with a low-privilege authenticated session sends a crafted HTTP request to /admin/add_sub_topic.php containing SQL metacharacters in the topic_id parameter. The malicious payload is concatenated into the backend query and executed by the database server. No user interaction is required beyond the attacker's own session activity.

The vulnerability mechanism is described in the referenced advisories. Refer to the VulDB Vulnerability #367538 entry and the GitHub Issue Report for the public technical details. No verified exploit code is reproduced here.

Detection Methods for CVE-2026-10258

Indicators of Compromise

HTTP requests to /admin/add_sub_topic.php containing SQL metacharacters such as single quotes, UNION, SELECT, --, or ; inside the topic_id parameter.
Unexpected database errors or long response times associated with requests targeting the add_sub_topic.php endpoint.
Administrative sessions originating from unusual IP addresses or geolocations interacting with the sub-topic functionality.

Detection Strategies

Inspect web server access logs for topic_id values that are non-numeric or contain encoded SQL syntax.
Deploy web application firewall (WAF) rules that detect SQL injection patterns targeting the CMS admin path.
Enable database query logging and correlate suspicious queries with HTTP traffic to add_sub_topic.php.

Monitoring Recommendations

Alert on repeated 500-series HTTP responses from /admin/add_sub_topic.php, which often indicate injection probing.
Monitor authentication logs for low-privilege admin accounts performing actions outside their normal scope.
Track outbound database connections from the CMS host for unexpected data egress volumes.

How to Mitigate CVE-2026-10258

Immediate Actions Required

Restrict network access to the /admin/ directory using IP allowlisting or a VPN until a vendor patch is verified.
Audit admin user accounts and rotate credentials, removing any unused low-privilege accounts that could be abused.
Apply a WAF signature blocking SQL metacharacters in the topic_id parameter on /admin/add_sub_topic.php.

Patch Information

No official vendor patch is referenced in the public advisories at the time of writing. Review the Itsourcecode Overview and the VulDB CVE-2026-10258 entry for vendor updates. Organizations that cannot wait for an upstream fix should modify /admin/add_sub_topic.php to use parameterized queries (for example, PDO prepared statements) and cast topic_id to an integer before use.

Workarounds

Replace string-concatenated SQL with prepared statements that bind topic_id as an integer parameter.
Enforce strict server-side input validation that rejects any non-numeric value for topic_id.
Run the database account used by the CMS with the minimum privileges required, removing rights such as DROP, FILE, or cross-database access.

bash

# Example nginx configuration to restrict access to the admin path
location /admin/ {
    allow 10.0.0.0/24;   # internal admin network
    deny all;
    # Block obvious SQLi patterns in query strings
    if ($args ~* "(union|select|--|;|')") {
        return 403;
    }
}