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CVE-2026-19253 – Unauthenticated Arbitrary File/Directory Deletion – Cache Enabler WordPress Plugin

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Summary

CVE-2026-19253 is a high-severity (CVSS 8.7) vulnerability in the Cache Enabler WordPress plugin affecting all versions prior to 1.8.17. The plugin’s cache purge routine fails to validate a URL before using it to build a filesystem path, allowing unauthenticated attackers to delete arbitrary files and directories on the server. Because no authentication is required, any internet-facing WordPress site running a vulnerable version is exposed to remote file-deletion attacks.

Technical details

  • Root cause: The plugin’s cache-clearing function constructs a filesystem path directly from a user-supplied URL without properly validating or sanitizing it, and without confining the resulting deletion to the intended cache directory (CWE-73: External Control of File Name or Path).
  • Trigger conditions: The public cache-clearing hook can be invoked with attacker-controlled URL input, including cases where other installed plugins or themes call the hook on an attacker’s behalf.
  • Attack vector: Network-based, requiring no authentication and no user interaction, though the attack complexity is rated high.
  • Impact: Deletion of arbitrary files and directories outside the plugin’s cache folder, which can disrupt site availability, remove critical WordPress files, or facilitate further compromise. The vulnerability does not expose confidentiality but has high integrity and availability impact.

Affected software

  • Cache Enabler WordPress plugin: all versions prior to 1.8.17

Severity

  • CVSS v3.1 Base Score: 8.7 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade the Cache Enabler plugin to version 1.8.17 or later, which validates URLs before using them to build filesystem paths and fixes the arbitrary deletion flaw.
  • If immediate patching is not possible: Restrict or disable public access to the plugin’s cache-purge functionality where feasible, audit server logs for unexpected file or directory deletions, and ensure regular backups are in place so deleted files can be restored.

References

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