CVE-2025-26540: Helloprint Path Traversal Vulnerability

CVE-2025-26540 Overview

CVE-2025-26540 is a path traversal vulnerability [CWE-22] in the Helloprint WordPress plugin. The flaw affects all versions up to and including 2.0.7. An authenticated attacker with low privileges can manipulate file path parameters to reference files outside the plugin's intended directory. Exploitation leads to arbitrary file deletion on the underlying WordPress host. Removing critical files such as wp-config.php can break site availability and force WordPress into a setup state that an attacker may abuse for site takeover. The vulnerability is exploitable over the network with low attack complexity and no user interaction.

Critical Impact
Authenticated attackers can delete arbitrary files on the WordPress server, causing denial of service and enabling potential follow-on site takeover.

Affected Products

Helloprint WordPress plugin versions through 2.0.7
WordPress sites with the Helloprint plugin installed and activated
Any hosting environment running a vulnerable Helloprint release

Discovery Timeline

2025-03-03 - CVE-2025-26540 published to the National Vulnerability Database
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-26540

Vulnerability Analysis

The Helloprint plugin exposes functionality that accepts a file path or filename parameter and performs a delete operation against it. The handler fails to enforce that the resolved path remains within an allowed directory. An authenticated user supplying traversal sequences such as ../ can escape the plugin directory and target arbitrary files writable by the web server process.

The impact is scoped to integrity-adjacent destructive actions rather than data disclosure. Confidentiality is not affected, and integrity in the strict CVSS sense is rated none, but availability impact is high because deletion of WordPress core files, plugin assets, or .htaccess renders the site unusable. The scope is changed because the vulnerable plugin component affects resources beyond its own security boundary.

Root Cause

The root cause is missing or insufficient input validation on a user-controlled path parameter before invoking a filesystem deletion call. The plugin does not canonicalize the requested path, reject directory traversal metacharacters, or constrain the operation to a safe base directory using an allowlist.

Attack Vector

An attacker authenticates to a vulnerable WordPress site with a low-privilege account. The attacker then submits a crafted request to the vulnerable plugin endpoint with a file, path, or similar parameter containing traversal sequences pointing to a sensitive file. The web server, running as the WordPress process owner, deletes the targeted file. Repeated requests can remove multiple files. Refer to the Patchstack Vulnerability Report for the disclosed technical details.

Detection Methods for CVE-2025-26540

Indicators of Compromise

HTTP requests to Helloprint plugin endpoints containing ../, ..%2f, or encoded traversal sequences in path or filename parameters
Unexpected deletion of WordPress core files such as wp-config.php, .htaccess, or index.php
WordPress installation reverting to the setup wizard or returning database connection errors
Authenticated POST requests from low-privilege accounts targeting plugin AJAX or admin-post handlers tied to Helloprint

Detection Strategies

Inspect web server access logs for requests to /wp-admin/admin-ajax.php or Helloprint plugin URLs containing traversal patterns
Monitor filesystem audit logs on the WordPress document root for unexpected unlink or delete operations performed by the PHP-FPM or web server user
Correlate authenticated session activity from non-administrator accounts with file deletion events on the host

Monitoring Recommendations

Enable file integrity monitoring on the WordPress installation directory and alert on deletion of core files
Forward WordPress and web server logs to a centralized analytics platform and apply rules for traversal payload signatures
Track plugin version inventory across WordPress estates to identify hosts still running Helloprint <= 2.0.7

How to Mitigate CVE-2025-26540

Immediate Actions Required

Deactivate and remove the Helloprint plugin until a fixed version is installed
Restrict WordPress account creation and audit existing low-privilege accounts for unexpected access
Take a verified backup of the WordPress filesystem and database before remediation
Deploy a web application firewall rule to block path traversal payloads targeting Helloprint endpoints

Patch Information

No fixed version is identified in the available advisory data. Consult the Patchstack Vulnerability Report and the official Helloprint plugin page for the latest release notes and patch availability before re-enabling the plugin.

Workarounds

Remove the Helloprint plugin directory from wp-content/plugins/ if the plugin is not business-critical
Apply filesystem permissions that prevent the web server user from deleting WordPress core files such as wp-config.php and .htaccess
Use a WAF or reverse proxy rule to reject requests containing ../, ..%2f, or ..%5c sequences on plugin endpoints

bash

# Example ModSecurity rule to block traversal attempts against Helloprint endpoints
SecRule REQUEST_URI "@contains helloprint" \
  "chain,deny,status:403,id:1026540,msg:'CVE-2025-26540 path traversal attempt'"
  SecRule ARGS "@rx (\.\./|\.\.%2f|\.\.%5c)" "t:lowercase,t:urlDecodeUni"