CVE-2025-26731: ARPrice WordPress Plugin XSS Vulnerability

CVE-2025-26731 Overview

CVE-2025-26731 is a stored Cross-Site Scripting (XSS) vulnerability in the ARPrice WordPress plugin developed by reputeinfosystems. The flaw stems from improper neutralization of user-supplied input during web page generation, classified as [CWE-79]. The vulnerability affects all versions of ARPrice up to and including 4.1.3. Authenticated attackers with low privileges can inject persistent JavaScript payloads that execute in the browsers of users who view the affected pages. The scope-changed impact enables attackers to reach resources beyond the vulnerable component, including administrative sessions.

Critical Impact
An authenticated attacker can store malicious scripts within ARPrice pricing table configurations, executing arbitrary JavaScript in the browser of any user who loads the affected content.

Affected Products

ARPrice WordPress plugin by reputeinfosystems
All versions from initial release through 4.1.3
WordPress sites with the ARPrice plugin installed and active

Discovery Timeline

2025-03-27 - CVE CVE-2025-26731 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-26731

Vulnerability Analysis

The vulnerability resides in ARPrice's handling of user-supplied input rendered into WordPress pages. The plugin fails to properly sanitize or encode input before storing it and later reflecting it in generated HTML. As a stored XSS flaw, payloads persist in the database and execute each time a victim loads the affected page.

Exploitation requires an authenticated user with permissions to modify ARPrice content and requires a victim to interact with the injected content. Because the vulnerability scope changes, injected scripts can operate against resources beyond the plugin itself, including WordPress administrative interfaces accessed by higher-privileged users.

Successful exploitation enables session hijacking, credential theft through injected forms, unauthorized administrative actions, and redirection of site visitors to attacker-controlled infrastructure.

Root Cause

ARPrice does not apply WordPress sanitization APIs such as sanitize_text_field() on input intake or esc_html() and esc_attr() on output. Input traverses from the plugin's configuration interface through the database and back into rendered HTML without neutralization of active script content.

Attack Vector

The attack requires network access to the WordPress site and low-privilege authenticated access with permissions to edit ARPrice pricing tables or related plugin configurations. The attacker submits input containing HTML or JavaScript payloads through a vulnerable plugin field. The payload is stored in the WordPress database. When any user loads a page rendering that content, the browser executes the attacker's script within the site's origin.

Refer to the Patchstack XSS Vulnerability Report for additional technical details.

Detection Methods for CVE-2025-26731

Indicators of Compromise

Unexpected <script> tags, javascript: URIs, or event handler attributes such as onerror and onload stored in WordPress database tables associated with ARPrice.
Outbound browser requests from administrator sessions to unfamiliar external domains after loading pages containing ARPrice content.
New or modified WordPress administrator accounts appearing shortly after low-privileged users edited ARPrice configurations.
Browser console errors or Content Security Policy violations reported on pages rendering ARPrice pricing tables.

Detection Strategies

Audit ARPrice-related database entries for HTML tags and JavaScript syntax within fields that should contain plain text or numeric values.
Review WordPress audit logs for edits to ARPrice content performed by non-administrative user accounts.
Deploy a web application firewall rule set that inspects POST parameters targeting ARPrice admin endpoints for script content.

Monitoring Recommendations

Enable WordPress activity logging to capture plugin configuration changes with user attribution and timestamps.
Monitor administrator browser sessions for anomalous outbound requests originating from the WordPress admin domain.
Alert on the creation of privileged WordPress accounts or role changes that follow ARPrice content modifications.

How to Mitigate CVE-2025-26731

Immediate Actions Required

Identify all WordPress installations running ARPrice version 4.1.3 or earlier and prioritize upgrades.
Restrict ARPrice editing permissions to trusted administrators until a patched version is deployed.
Review existing ARPrice configurations and pricing table content for injected scripts and remove any suspicious payloads.
Rotate credentials for any WordPress users who accessed affected pages before remediation.

Patch Information

The vulnerability affects ARPrice versions up to and including 4.1.3. Site administrators should apply the vendor update tracked in the Patchstack advisory as soon as a fixed release is available. Verify plugin version after update through the WordPress plugins dashboard.

Workarounds

Deactivate the ARPrice plugin on affected sites until a patched version is installed.
Implement a strict Content Security Policy that blocks inline scripts and untrusted external script sources.
Limit user roles capable of editing ARPrice content to administrators only through the WordPress capabilities system.
Deploy a web application firewall with rules that block XSS payloads in requests to WordPress admin endpoints.

bash

# Configuration example
# Add a restrictive Content Security Policy header via .htaccess
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'"

# Restrict access to WordPress admin to specific IPs
<Files wp-admin>
  Require ip 203.0.113.0/24
</Files>