CVE-2026-14698: SourceCodester LMS RCE Vulnerability

CVE-2026-14698 Overview

CVE-2026-14698 is an unrestricted file upload vulnerability in SourceCodester Syllabus-Aligned Learning Management and Examination System 1.0. The flaw resides in the upload_files.php component, which fails to validate uploaded file types or content. Authenticated remote attackers can manipulate the upload functionality to deliver arbitrary files to the target server. Public exploit details have been released, increasing the likelihood of opportunistic exploitation against exposed instances. The weakness is classified under [CWE-284] Improper Access Control.

Critical Impact
Remote authenticated attackers can upload arbitrary files through upload_files.php, potentially enabling web shell deployment and follow-on server compromise.

Affected Products

SourceCodester Syllabus-Aligned Learning Management and Examination System 1.0
upload_files.php component within the application
Deployments exposing the upload endpoint to untrusted networks

Discovery Timeline

2026-07-05 - CVE-2026-14698 published to NVD
2026-07-06 - Last updated in NVD database

Technical Details for CVE-2026-14698

Vulnerability Analysis

The vulnerability originates in the upload_files.php script of the Syllabus-Aligned Learning Management and Examination System. The endpoint accepts file uploads without enforcing restrictions on extension, MIME type, or content signature. Attackers with low-privilege access can submit crafted multipart requests to store server-executable files inside a web-accessible directory. Once written to disk, the uploaded payload may be requested directly through the web server, granting code execution in the application context.

The issue is remotely reachable and requires only network access to the vulnerable endpoint alongside valid session credentials. Public exploit material has been distributed through third-party disclosure platforms, so defenders should assume proof-of-concept knowledge is widespread. EPSS currently estimates a 0.209% probability of exploitation activity in the next 30 days.

Root Cause

The root cause is missing server-side validation on the file upload handler. The application relies on client-provided metadata rather than performing extension allow-listing, MIME sniffing, or content inspection. This maps to [CWE-284] Improper Access Control because the upload routine does not enforce the security policy expected for privileged file operations.

Attack Vector

An attacker with low-privileged credentials sends a crafted POST request to upload_files.php containing an executable payload such as a PHP web shell. The server writes the file to a web-reachable path. The attacker then issues a follow-up GET request to invoke the payload, achieving arbitrary command execution under the web server user. No user interaction is required beyond initial authentication.

No verified public exploit code is included in this advisory. Refer to the VulDB CVE-2026-14698 entry and the VulDB Vulnerability #376294 record for technical write-ups.

Detection Methods for CVE-2026-14698

Indicators of Compromise

New files with executable extensions such as .php, .phtml, or .phar appearing in upload directories associated with the application.
HTTP POST requests to upload_files.php followed shortly by GET requests to previously unseen files in the same directory.
Web server processes spawning unexpected child processes such as sh, bash, cmd.exe, or powershell.exe.

Detection Strategies

Inspect web server access logs for anomalous upload activity, particularly requests to upload_files.php from unusual user agents or source IPs.
Deploy file integrity monitoring on directories writable by the web application to alert on the creation of script files.
Correlate authentication events with upload activity to identify low-privilege accounts writing executable content.

Monitoring Recommendations

Enable verbose logging on the PHP interpreter and web server to capture request bodies and response codes for upload endpoints.
Forward web and host telemetry to a centralized analytics platform for behavioral correlation.
Alert on outbound network connections initiated by the web server process to unexpected destinations, which often follows web shell deployment.

How to Mitigate CVE-2026-14698

Immediate Actions Required

Restrict network exposure of the Syllabus-Aligned Learning Management and Examination System to trusted networks or place it behind a web application firewall.
Disable or block access to upload_files.php until upstream remediation is available.
Audit existing upload directories for unauthorized files and remove any unrecognized executable content.
Rotate credentials for any accounts that may have interacted with the vulnerable endpoint.

Patch Information

No official vendor patch is referenced in the advisory data. Monitor the SourceCodester project site and the VulDB submission #846859 for updates. Until a fix is issued, organizations should apply compensating controls and treat the deployment as untrusted.

Workarounds

Configure the web server to deny execution of scripts within upload directories using directives such as php_flag engine off or equivalent handler removal.
Enforce strict allow-listing on the upload handler by proxying requests through a filtering layer that validates extension and MIME type.
Require multi-factor authentication for accounts able to reach the upload endpoint to reduce credential-based access.

bash

# Example Apache configuration blocking script execution in the uploads directory
<Directory "/var/www/lms/uploads">
    php_flag engine off
    RemoveHandler .php .phtml .phar
    RemoveType .php .phtml .phar
    <FilesMatch "\.(php|phtml|phar)$">
        Require all denied
    </FilesMatch>
</Directory>