phpTransformer 2016.9 Directory Traversal via jQueryFileUpload

The primary impact of CVE-2019-25579 is the potential for unauthorized access to files outside the intended directory. Attackers can leverage traversal sequences like ../../../…… in requests to the jQueryFileUploadmaster endpoint to navigate the file system. This could allow them to read sensitive configuration files containing database credentials, API keys, or other secrets. Depending on the server's configuration and file permissions, an attacker might even be able to modify or delete files, leading to a complete compromise of the system. The vulnerability's unauthenticated nature means that no prior authentication is required to exploit it, significantly broadening the attack surface.

Web applications utilizing phpTransformer versions 2016.9 through 2016.9 are at risk. This includes applications that rely on phpTransformer for image processing or other file manipulation tasks. Shared hosting environments where multiple users share the same server are particularly vulnerable, as a compromise of one application could potentially expose files belonging to other users.

• php: Examine access logs for requests containing traversal sequences like '../' in the path parameter.

grep '../' /var/log/apache2/access.log

• php: Check for unusual file access patterns in server logs.

journalctl -u apache2 | grep -i "file not found"

• generic web: Use curl to test the jQueryFileUploadmaster endpoint with various traversal sequences.

curl 'http://your-server/jqueryFileUploadmaster?path=../../../../../../etc/passwd'

1. 2026-03-21Disclosure

   disclosure

1. Reserviert2026-03-21
2. Veröffentlicht2026-03-21
3. Geändert2026-03-24
4. EPSS aktualisiert2026-03-29

The primary mitigation for CVE-2019-25579 is to upgrade to a patched version of phpTransformer. Unfortunately, no specific patched version is provided in the CVE data. As a temporary workaround, restrict access to the jQueryFileUploadmaster endpoint using a Web Application Firewall (WAF) or proxy server. Implement strict input validation on the path parameter, rejecting any requests containing traversal sequences. Regularly review file permissions to ensure that sensitive files are not accessible to unauthorized users. After applying any mitigation, verify the fix by attempting to access files outside the intended directory using a crafted request.