Executive Summary

CVE-2026-55744 is a Cross-Site Request Forgery (CSRF) vulnerability in the Cotonti CMS's Personal File Storage (PFS) module, specifically in the file upload functionality. The vulnerability occurs because the file upload action does not validate the anti-CSRF token, allowing a remote attacker to trick an authenticated user into uploading arbitrary files to their PFS storage by visiting a malicious page.

Additionally, the vulnerability involves insufficient input validation and improper access controls in the PFS module, which can allow attackers with write permissions to delete files, upload malicious files, or manipulate folder structures beyond their intended scope.

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Impact Analysis

This vulnerability can have serious impacts including unauthorized file uploads, deletion of arbitrary files, and manipulation of folder structures within the affected user's Personal File Storage.

Successful exploitation could lead to data loss, unauthorized access to sensitive files, and potentially remote code execution if malicious files are uploaded and executed on the server.

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Detection Guidance

This vulnerability involves the Cotonti CMS Personal File Storage (PFS) module improperly handling file uploads without validating anti-CSRF tokens. Detection involves monitoring for unauthorized or forged multipart file upload requests targeting the 'a=upload' action in the PFS module.

You can detect potential exploitation attempts by inspecting web server logs for suspicious POST requests to the PFS upload endpoint that lack proper CSRF tokens.

Suggested commands include using tools like curl or tcpdump to capture and analyze HTTP requests:

• Use tcpdump or Wireshark to capture HTTP traffic and filter for POST requests containing 'a=upload' in the URL.
• Use grep on web server access logs to find POST requests to the PFS upload endpoint, e.g., `grep 'POST.*a=upload' /var/log/apache2/access.log`.
• Use curl to simulate a file upload request and verify if the anti-CSRF token is required, e.g., `curl -X POST -F '[email protected]' 'http://targetsite/modules/pfs/index.php?a=upload'`.

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Mitigation Strategies

Immediate mitigation steps include updating Cotonti CMS to the latest version where this vulnerability is patched.

Apply patches that enforce stricter input validation, proper permission checks, and secure file handling in the PFS module.

Restrict write permissions to the PFS system to trusted users only, minimizing the risk of exploitation.

Implement web application firewall (WAF) rules to block unauthorized multipart file upload requests lacking valid anti-CSRF tokens.

Educate users to avoid clicking on suspicious links that could trigger CSRF attacks.

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Compliance Impact

The vulnerability in Cotonti's Personal File Storage (PFS) module allows an attacker to upload arbitrary files by exploiting a missing anti-CSRF token validation. This can lead to unauthorized file access, data loss, or remote code execution.

Such unauthorized access and potential data compromise could negatively impact compliance with data protection regulations like GDPR and HIPAA, which require strict controls over personal and sensitive data to prevent unauthorized access and ensure data integrity.

Failure to prevent unauthorized file uploads and access may result in violations of these standards, potentially leading to legal and financial consequences for organizations using vulnerable versions of Cotonti.

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