CVE-2025-4926: PHPGurukul Car Rental Portal RCE Flaw

CVE-2025-4926 Overview

CVE-2025-4926 is an unrestricted file upload vulnerability in PHPGurukul Car Rental Project 1.0. The flaw resides in the /admin/post-avehical.php script, where the img1, img2, img3, img4, and img5 parameters accept attacker-controlled files without proper validation. An authenticated attacker with administrative privileges can upload arbitrary content over the network. The issue has been publicly disclosed and is tracked under CWE-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type).

Critical Impact
Attackers with admin access can upload malicious files through vehicle image parameters, potentially leading to code execution on the hosting server.

Affected Products

PHPGurukul Car Rental Portal 1.0
cpe:2.3:a:phpgurukul:car_rental_portal:1.0:*:*:*:*:*:*:*
Component: phpgurukul:car_rental_portal

Discovery Timeline

2025-05-19 - CVE-2025-4926 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-4926

Vulnerability Analysis

The vulnerability exists within the administrative vehicle posting workflow of PHPGurukul Car Rental Portal 1.0. The /admin/post-avehical.php endpoint processes five image upload parameters: img1, img2, img3, img4, and img5. The application fails to enforce file type, extension, or content validation before persisting the uploaded files to disk.

An attacker can manipulate any of these parameters to deliver a PHP payload or other executable content. Once written to a web-accessible directory, the file may be requested directly through the HTTP server, leading to server-side code execution within the application context.

The issue is remotely exploitable across the network but requires high privileges, since the vulnerable endpoint is gated behind administrative authentication. Public disclosure of exploitation details has occurred through the GitHub Issue Tracker and VulDB #309488.

Root Cause

The root cause is missing server-side validation on file uploads, classified under CWE-434. The handler accepts arbitrary file extensions and MIME types for the img1 through img5 parameters and does not restrict execution permissions on the destination directory. The combination satisfies both CWE-284 and CWE-434 weaknesses.

Attack Vector

The attack vector is network-based and targets the administrative interface. An authenticated administrator, or an attacker who has obtained admin credentials through phishing, credential reuse, or a separate authentication flaw, can submit a crafted multipart POST request to /admin/post-avehical.php. The malicious file is bound to one of the img1 through img5 form fields, with a PHP or other server-executable extension. After upload, the attacker requests the file directly to trigger execution. EPSS data lists this CVE at 0.369% probability with a 28.473 percentile as of 2026-06-22.

No verified exploit code is published in trusted PoC repositories at this time. Refer to the VulDB CTI entry for additional technical context.

Detection Methods for CVE-2025-4926

Indicators of Compromise

Files with executable extensions such as .php, .phtml, or .phar present in the Car Rental Portal image upload directory.
HTTP POST requests to /admin/post-avehical.php containing multipart boundaries with non-image content types in the img1 through img5 fields.
New or unexpected files in web-accessible directories with recent modification timestamps from administrative sessions.
Outbound network connections originating from the PHP-FPM or web server process to attacker-controlled infrastructure.

Detection Strategies

Inspect web server access logs for POST requests to /admin/post-avehical.php followed by GET requests to newly created files in the uploads directory.
Deploy file integrity monitoring on the Car Rental Portal upload directories to flag any non-image file types.
Use a web application firewall ruleset that validates Content-Type and file magic bytes for multipart uploads to administrative endpoints.

Monitoring Recommendations

Alert on web server process spawning shell interpreters such as sh, bash, or cmd.exe.
Monitor administrative authentication events for anomalous source IPs or off-hours logins preceding upload activity.
Capture and retain full HTTP request bodies for the /admin/ path to enable retrospective hunting.

How to Mitigate CVE-2025-4926

Immediate Actions Required

Restrict access to the /admin/ directory using IP allow-listing or VPN-only access until a vendor fix is available.
Rotate all administrative credentials for the Car Rental Portal and enforce strong, unique passwords.
Audit the uploads directory for files with non-image extensions and remove any unauthorized content.
Configure the web server to disable PHP execution within upload directories using directives such as php_admin_flag engine off.

Patch Information

No official vendor patch is referenced in the NVD entry at the time of publication. Monitor the PHP Gurukul Blog and the GitHub Issue Tracker for vendor responses and remediation updates. If the application is non-essential, consider taking the affected instance offline until guidance is published.

Workarounds

Apply server-side validation by patching /admin/post-avehical.php locally to enforce an allow-list of image MIME types and extensions such as .jpg, .jpeg, .png, and .gif.
Rename uploaded files to randomized identifiers and strip user-supplied extensions before saving to disk.
Store uploads outside the web root and serve them through a controlled read-only handler that sets Content-Type: image/*.
Deploy a WAF rule that blocks multipart uploads to /admin/post-avehical.php when the file magic bytes do not match a known image signature.

bash

# Apache configuration example to disable PHP execution in the uploads directory
<Directory "/var/www/carrental/admin/img/">
    php_admin_flag engine off
    AddType text/plain .php .phtml .phar .php3 .php5 .pht
    <FilesMatch "\.(php|phtml|phar|php3|php5|pht)$">
        Require all denied
    </FilesMatch>
</Directory>