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CVE-2026-84171 – Unauthenticated Arbitrary File Upload / RCE – WP Images Upload on Piclect ≤ 1.0

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Summary

CVE-2026-84171 is a critical unauthenticated arbitrary file upload vulnerability in the WordPress plugin "WP images upload on piclect," affecting all versions up to and including 1.0. The plugin fails to validate the name or type of files submitted through its upload functionality, allowing any unauthenticated attacker to place attacker-controlled files (including PHP scripts) into a publicly accessible directory on the web server. Successful exploitation can lead to full remote code execution and complete compromise of the affected WordPress site, and the issue carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The plugin’s image upload handler does not verify the filename or MIME/content type of files before writing them to a directory served directly by the web server.
  • Trigger conditions: An attacker sends a crafted upload request to the plugin’s upload endpoint; no authentication, prior privileges, or user interaction are required.
  • Attack vector: Network — the vulnerability is exploitable remotely over HTTP/HTTPS against any site running the vulnerable plugin.
  • Impact: Because uploaded files (e.g., PHP web shells) are stored in a web-accessible location and can be executed by the server, exploitation can result in arbitrary code execution, full compromise of confidentiality, integrity, and availability of the affected system, and a foothold for further lateral movement.
  • Weakness classification: CWE-434 (Unrestricted Upload of File with Dangerous Type).

Affected software

  • WP images upload on piclect (WordPress plugin) — all versions through 1.0 (i.e., "≤ 1.0")

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: As of publication, no patched version of "WP images upload on piclect" has been released. Organizations should immediately deactivate and uninstall the plugin, or remove it from the WordPress environment entirely.
  • If no patch is available:
    • Restrict or block public access to the plugin’s upload directory and disable script execution (e.g., PHP execution) within upload/media directories via web server configuration.
    • Deploy a web application firewall (WAF) rule to detect and block unauthenticated file upload attempts targeting this plugin’s endpoint.
    • Monitor web-accessible upload directories for newly written script files (e.g., .php, .phtml) as an indicator of exploitation attempts.
    • Where the plugin cannot be removed immediately, isolate or take the affected site offline until a fix is available or the plugin is replaced with a maintained alternative.

References

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