CVE-2025-3798: Wcms Wcms RCE Vulnerability

CVE-2025-3798 Overview

CVE-2025-3798 is an unrestricted file upload vulnerability affecting WCMS 11. The flaw resides in the sub function of app/admin/AdvadminController.php within the Advertisement Image Handler component. An authenticated attacker with high privileges can manipulate the upload functionality to place arbitrary files on the server over the network. The exploit details have been publicly disclosed, increasing the risk that opportunistic attackers will weaponize the issue. The vulnerability is tracked under [CWE-284: Improper Access Control].

Critical Impact
Public disclosure of exploit details for an unrestricted upload flaw in a web content management system creates a path to webshell deployment and follow-on remote code execution within affected WCMS 11 installations.

Affected Products

WCMS 11.0
WCMS Advertisement Image Handler component
app/admin/AdvadminController.phpsub function

Discovery Timeline

2025-04-19 - CVE-2025-3798 published to NVD
2025-07-15 - Last updated in NVD database

Technical Details for CVE-2025-3798

Vulnerability Analysis

The vulnerability stems from improper validation of uploaded files within the WCMS administrative advertisement workflow. The sub function inside app/admin/AdvadminController.php accepts file submissions intended for advertisement images but fails to enforce restrictions on file type, extension, or content. An authenticated administrative user can submit a file containing server-executable content rather than an image. Because WCMS stores the uploaded artifact within a web-accessible directory, an attacker who reaches that file through a normal HTTP request can trigger execution of attacker-controlled code.

The network attack vector makes this exploitable remotely without prior code execution on the host. Exploit details have been published, lowering the technical barrier for reproduction. The impact spans confidentiality, integrity, and availability of the WCMS instance and any data it processes.

Root Cause

The root cause is missing access control and input validation in the advertisement image upload handler. The sub function trusts the supplied filename and MIME information without verifying the underlying file content, extension allow-listing, or storage path enforcement. This pattern aligns with [CWE-284: Improper Access Control] and reflects a broader failure to constrain attacker-controllable inputs reaching a sensitive file system operation.

Attack Vector

An attacker authenticated to the WCMS administrative interface issues a crafted POST request to the advertisement upload endpoint handled by AdvadminController.php. The request includes a payload such as a PHP script disguised with image metadata or a permissive extension. After upload, the attacker requests the stored file via its public URL, causing the web server to execute the payload. The result is a webshell foothold within the WCMS deployment. Refer to the GitHub Issue Discussion and VulDB entry #305651 for the public disclosure.

Detection Methods for CVE-2025-3798

Indicators of Compromise

Unexpected .php, .phtml, or other executable files within WCMS advertisement upload directories.
POST requests to administrative routes invoking AdvadminController.phpsub with non-image Content-Type or extension mismatches.
Outbound connections initiated by the web server process shortly after an administrative upload event.
New administrative sessions originating from atypical IP ranges immediately preceding upload activity.

Detection Strategies

Inspect web server access logs for POST requests to advertisement upload endpoints followed by GET requests to newly created files in the same directory.
Hash and inventory files under WCMS upload paths to flag any non-image MIME types.
Enable file integrity monitoring on directories writable by the WCMS application user.

Monitoring Recommendations

Forward WCMS application and web server logs to a centralized analytics platform for correlation of upload and execution events.
Alert on web server processes spawning shell interpreters such as sh, bash, or cmd.exe.
Track administrative authentication anomalies, including credential reuse and session creation outside business hours.

How to Mitigate CVE-2025-3798

Immediate Actions Required

Restrict network access to the WCMS administrative interface using IP allow-lists or VPN-only access.
Rotate credentials for all WCMS administrative accounts and enforce strong authentication.
Audit the advertisement upload directory for unauthorized files and remove any non-image artifacts.
Review web server and application logs for prior exploitation attempts dating back to the April 2025 disclosure.

Patch Information

No vendor patch advisory is referenced in the available CVE data. Operators of WCMS 11.0 should monitor the WCMS project channels and the VulDB record for remediation updates and apply fixes once published.

Workarounds

Disable or remove the advertisement image upload functionality if it is not required for business operations.
Configure the web server to deny script execution within upload directories, for example via php_admin_flag engine off in Apache or equivalent location directives in Nginx.
Add a reverse proxy or web application firewall rule that blocks uploads where file content does not match a strict image MIME allow-list.
Run the WCMS application under a least-privilege account that cannot write to directories outside its upload scope.

bash

# Example Nginx configuration disabling script execution in WCMS upload paths
location ~* ^/uploads/.*\.(php|phtml|phar|pl|py|jsp|asp|sh|cgi)$ {
    deny all;
    return 403;
}