CVE-2026-19253 in Cache Enabler Plugin
Summary
by MITRE • 10/01/2026
The Cache Enabler WordPress plugin before 1.8.17 does not validate a URL before using it to build a filesystem path in its cache purge routine, and does not confine the resulting deletion to the cache directory, allowing unauthenticated users to delete arbitrary files and directories on sites where another installed Cache Enabler WordPress plugin before 1.8.17 or passes a request-derived URL to its public cache-clearing hook.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified in versions of the Cache Enabler WordPress plugin prior to release 1.8.17 represents a critical server-side path traversal flaw that compromises the integrity and availability of web applications running on affected systems. This security defect stems from an insufficient validation mechanism within the plugin's cache purge routine, where user-supplied input is directly incorporated into filesystem operations without adequate sanitization or boundary checks. Specifically, when the plugin processes requests to clear cached content, it constructs a file system path based on the provided URL parameter but fails to ensure that this path remains confined within the designated cache directory structure. This lack of confinement allows an attacker to manipulate the input string using standard directory traversal sequences, such as dot-dot-slash characters, to escape the intended scope and target arbitrary locations on the underlying server's file system.
From a technical perspective, this flaw is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which highlights the failure to restrict access to resources outside of an allowed directory tree. The operational impact of this vulnerability is severe because it grants unauthenticated actors the ability to delete arbitrary files and directories on the hosting environment. In many WordPress deployments, particularly those utilizing shared hosting or less restrictive server configurations, the web process may have write permissions that extend beyond the application's root directory. Consequently, an attacker could potentially remove critical configuration files, database connection scripts, or even system-level files if permission structures allow it. This capability directly leads to a denial of service condition by rendering the website inoperable through the destruction of essential components, and it may also facilitate further attacks such as data exfiltration or privilege escalation depending on what other vulnerabilities exist within the same environment.
The attack vector for this vulnerability is particularly concerning because it does not require authentication, aligning with ATT&CK technique T1485: Data Destruction. The exploitation typically involves sending a crafted HTTP request to the public cache-clearing endpoint exposed by the plugin or another compatible Cache Enabler-based plugin that passes user-derived URLs into its clearing hooks. Since many WordPress plugins expose administrative functions via AJAX endpoints accessible without login if not properly secured, this flaw can be triggered remotely over the network with minimal effort. The absence of a requirement for valid session tokens or administrator privileges significantly lowers the barrier to entry for malicious actors seeking to disrupt service or cause damage to the target infrastructure.
To mitigate this risk, immediate action is required by upgrading the Cache Enabler plugin and any related components to version 1.8.17 or later, where these path validation checks have been implemented. Administrators should verify that all plugins are up to date with their latest security patches from official repositories. Additionally, implementing strict file permission policies on the web server can reduce the blast radius of such vulnerabilities; ensuring that the web process user has read-only access to most directories and write access only to specific cache or upload folders limits the ability of an attacker to delete critical system files even if a path traversal is successfully executed. Regular security audits and monitoring for unusual file deletion activity on the server can also aid in early detection and response to potential exploitation attempts.