Description

The Developer Tools WordPress plugin through 1.1.3 contains an unauthenticated arbitrary file upload vulnerability in the bundled SWFUpload component

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-09-02T15:17:37.127Z",
  "pubdate": "2026-09-02T15:17:37.127Z",
  "executiveSummary": "The Developer Tools WordPress plugin, specifically through version 1.1.3, is susceptible to an unauthenticated arbitrary file upload vulnerability. This security flaw originates from the inclusion of the legacy, third-party SWFUpload component, which fails to adequately sanitize or restrict file types during the upload process.\nThe vulnerability allows remote, unauthenticated attackers to upload malicious files, such as PHP web shells, directly to the web server. Successful exploitation grants the adversary the ability to execute arbitrary code within the context of the web server process. This leads to full system compromise, including unauthorized access to sensitive application data, database modification, potential cross-site scripting (XSS) attacks against administrative users, and the ability to pivot within the host network.\nGiven the nature of this flaw, it poses a critical risk to the confidentiality, integrity, and availability of the WordPress environment. The exploit requires no authentication, significantly lowering the barrier to entry for malicious actors. Immediate remediation is necessary to prevent potential exploitation.",
  "technicalDetails": "The vulnerability exists due to the integration of the SWFUpload component within the Developer Tools plugin versions 1.1.3 and earlier. SWFUpload is a legacy library that historically facilitated file uploads via Adobe Flash; however, it lacks modern security controls required to prevent unauthorized file type submissions in a server-side context.\nThe root cause is the improper handling of file upload requests directed at the bundled SWFUpload handler. The application fails to enforce strict server-side validation of MIME types, file extensions, or content signatures. Because the component operates without authentication, any remote user can interact with the handler endpoint.\nThe attack flow begins when an attacker sends a specially crafted POST request containing a malicious payload—typically a PHP script—to the SWFUpload processing endpoint associated with the Developer Tools plugin. Because the endpoint does not verify the requester's identity or session status, the request is processed by the server.\nUpon receiving the request, the insecure file handler persists the uploaded file into an accessible directory within the web root. An attacker can then determine the path of the uploaded file and initiate a subsequent HTTP GET request to execute the payload. Since the server treats the uploaded file as a valid script, the attacker's code is executed with the privileges of the web server (e.g., www-data).\nThis vulnerability is particularly severe because it bypasses standard WordPress permission models. The payload behavior allows for the deployment of persistent backdoors, enabling persistent remote command execution (RCE). Post-exploitation impact includes full control over the WordPress instance, enabling the attacker to modify the plugin configuration, dump the database, inject malicious JavaScript into site pages to compromise end-users, or use the server as a node for further network attacks.\nThe vulnerability is exposed directly to the network. As long as the Developer Tools plugin is active and the SWFUpload component is reachable, the target is exposed to unauthenticated exploitation. There is no requirement for high-level privileges; the vulnerability is accessible to any remote entity capable of reaching the web server."
}