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New CVE Detected

CVE-2026-118423 – Unauthenticated Arbitrary File Upload / RCE – WP Libre Form WordPress Plugin 1.5.0

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Summary

CVE-2026-118423 is an unrestricted file upload vulnerability (CWE-434) in the WP Libre Form WordPress plugin that leads to unauthenticated remote code execution. It is rated Critical, with a CVSS v3.1 base score of 10.0.

Technical details

  • Root cause: the plugin does not validate the type of files uploaded through its form submissions (CWE-434, Unrestricted Upload of File with Dangerous Type).
  • Trigger conditions: an attacker submits a file through a WP Libre Form submission. No authentication or user interaction is required.
  • Attack vector: network, low attack complexity.
  • Impact: an attacker can upload PHP files to a web-accessible location and execute them. This gives remote code execution on the web server, with high impact on confidentiality, integrity and availability.

Affected software

  • WP Libre Form WordPress plugin version 1.5.0.1 and earlier, as stated in the CVE record.

Severity

  • CVSS v3.1 base score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: the CVE record did not list a fixed version at the time of writing. Check the plugin’s official WordPress.org page and the vendor for an updated release, and upgrade as soon as one is available.
  • If no patch is available: deactivate and remove the WP Libre Form plugin, or disable its file-upload form functionality, until a fix is released.
  • Restrict script execution in the WordPress uploads directories, for example at the web server or WAF level. Block PHP execution there.
  • Review upload directories for unexpected PHP or other executable files, and review web server logs for unusual form submissions. If you find anything suspicious, treat the host as potentially compromised.

References

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