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CVE-2026-123751 – Unauthenticated Arbitrary File Upload / RCE – WP Duplicate WordPress Plugin throug

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Summary

CVE-2026-123751 is an unauthenticated arbitrary file upload vulnerability (CWE-434) in the WP Duplicate WordPress plugin (formerly LocalSync) in versions through 1.1.11. It allows remote attackers to write arbitrary files to the server and achieve remote code execution. The CVSS v3.1 base score is 9.8 (Critical). The CVE record states that the flaw is exploited in the wild, though some trackers report no confirmed exploitation.

Technical details

  • Root cause: The plugin does not properly verify a request authentication value, and it does not validate the path or type of uploaded files.
  • Trigger conditions: An attacker sends a crafted request to a site running an affected version. No authentication or user interaction is required.
  • Attack vector: Network, low complexity, no privileges required.
  • Impact: Arbitrary file write on the server, which leads to remote code execution and a full compromise of confidentiality, integrity and availability.

Affected software

  • WP Duplicate WordPress plugin (formerly LocalSync), all versions through 1.1.11

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: WPScan lists no known fix at the time of writing. Deactivate and remove the plugin until a patched release is published.
  • Review the uploads folder and plugin directories for unexpected PHP or other executable files, and check web server logs for unauthenticated requests to the plugin’s endpoints.
  • If compromise is suspected, follow incident response procedures: rotate credentials and secrets stored on the host, and restore from a known-good backup.
  • Where the plugin cannot be removed immediately, restrict access to it with a WAF or network controls.

References

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