CVE-2026-95820: College-Notes-Gallery RCE Vulnerability

CVE-2026-95820 Overview

CVE-2026-95820 is an unrestricted file upload vulnerability in the anirbandutta9 College-Notes-Gallery application, affecting commits up to 8c1cf3d98f30982d069c88ca172612c001eb39f6. The flaw resides in the /dashboard/userprofile.php?section=admin1 endpoint, where the image parameter accepts uploaded files without proper validation. Remote authenticated attackers can manipulate the image argument to upload arbitrary files. The exploit has been publicly disclosed. Because the project follows a rolling-release model, no fixed version identifier is available, and the vendor did not respond to disclosure attempts. The weakness is classified under [CWE-284: Improper Access Control].

Critical Impact

Authenticated remote attackers can upload arbitrary files through the image parameter, potentially enabling web shell placement and compromise of the hosting environment.

Affected Products

• anirbandutta9 College-Notes-Gallery (rolling release)
• Affected commit range: up to 8c1cf3d98f30982d069c88ca172612c001eb39f6
• Vulnerable component: /dashboard/userprofile.php?section=admin1

Discovery Timeline

• 2026-09-22 - CVE-2026-95820 published to NVD
• 2026-09-23 - Last updated in NVD database

Technical Details for CVE-2026-95820

Vulnerability Analysis

The vulnerability exists in the user profile dashboard functionality of College-Notes-Gallery. When a user submits a request to /dashboard/userprofile.php?section=admin1, the application processes the image parameter as an uploaded file. The upload handler does not enforce restrictions on file type, extension, MIME type, or content. An authenticated attacker can therefore submit a PHP file, script, or other executable content in place of an image. Because the application is a PHP web application, uploaded files placed within the document root can be requested directly, allowing server-side code execution when the file is interpreted by the PHP engine. The public availability of exploit details lowers the barrier to weaponization.

Root Cause

The root cause is improper access control on the file upload handler [CWE-284]. The application trusts client-supplied input when handling the image argument and omits allowlist validation on file extensions, magic-byte inspection, and storage-path enforcement. Without these controls, any file type can be written to a server-reachable location.

Attack Vector

The attack is network-based and requires low privileges, consistent with an authenticated user role that can access the profile dashboard. The attacker sends a crafted multipart form request to /dashboard/userprofile.php?section=admin1 with a malicious payload assigned to the image field. No user interaction is required. Public exploit details for this issue are referenced by the VulDB CVE-2026-95820 Details entry and the GitHub CVE Issue Discussion.

Detection Methods for CVE-2026-95820

Indicators of Compromise

• HTTP POST requests to /dashboard/userprofile.php?section=admin1 containing multipart uploads where the image field carries non-image extensions such as .php, .phtml, .phar, or .jsp.
• Unexpected files with executable extensions appearing in the upload storage directory used by the profile handler.
• Web server access logs showing direct GET requests to newly created files in the uploads path, especially followed by outbound network activity from the web process.

Detection Strategies

• Deploy web application firewall rules that inspect uploads to the profile endpoint and block requests where the image field content type or extension is not an approved image format.
• Monitor PHP process telemetry for child processes spawned by the web server user, which often indicates web shell execution following an upload.
• Correlate authentication events with file-write events in the web root to flag unusual upload volume or off-hours activity by a single account.

Monitoring Recommendations

• Enable file integrity monitoring on the College-Notes-Gallery upload directory and alert on any new file with a server-executable extension.
• Ingest web server, PHP-FPM, and endpoint telemetry into a centralized platform to enable cross-source hunting for post-upload command execution.
• Track outbound connections from the web application host to non-approved destinations, which can indicate reverse shell activity from a planted payload.

How to Mitigate CVE-2026-95820

Immediate Actions Required

• Restrict access to the /dashboard/userprofile.php?section=admin1 endpoint at the reverse proxy or web server layer until a code fix is in place.
• Disable PHP execution in directories used for user-uploaded content by adjusting web server configuration.
• Audit the upload directory for unknown files and remove any content that was not produced by legitimate user activity.
• Rotate credentials for any accounts that had access to the profile dashboard during the exposure window.

Patch Information

No vendor patch is available. The project uses a rolling release and the vendor did not respond to disclosure attempts, according to the VulDB CVE-2026-95820 Details advisory. Administrators must apply source-level fixes themselves: validate the image parameter against an allowlist of image MIME types, verify magic bytes, rename uploaded files to non-executable names, and store uploads outside the web root.

Workarounds

• Place the application behind a web application firewall that blocks multipart uploads whose declared or detected content type is not an approved image format.
• Configure the web server to serve the upload path as static content only, explicitly denying execution of .php, .phtml, and .phar files.
• Enforce least-privilege file system permissions so that the web server user cannot write to directories that are also served with script execution enabled.
• If administrative profile editing is not required in production, disable the admin1 section of userprofile.php entirely.

# Example Apache configuration to disable PHP execution in the uploads directory
<Directory "/var/www/college-notes-gallery/uploads">
    php_admin_flag engine off
    AddType text/plain .php .phtml .phar .php3 .php4 .php5 .php7
    Options -ExecCGI
    <FilesMatch "\.(php|phtml|phar|php[0-9])$">
        Require all denied
    </FilesMatch>
</Directory>