CVE-2025-39582: WP Data Access DOM-Based XSS Vulnerability

CVE-2025-39582 is a DOM-based cross-site scripting vulnerability in the WP Data Access WordPress plugin affecting versions up to 5.5.36. This flaw allows attackers to inject malicious scripts into web pages. This article covers technical details, affected versions, security impact, and mitigation strategies.

CVE-2025-39582 Overview

CVE-2025-39582 is a DOM-based Cross-Site Scripting (XSS) vulnerability in the WP Data Access WordPress plugin developed by Passionate Programmer Peter. The flaw stems from improper neutralization of input during web page generation, classified under [CWE-79]. All versions of WP Data Access up to and including 5.5.36 are affected.

An authenticated attacker with low privileges can inject malicious script content that executes in the browser of a victim who interacts with a crafted request. Successful exploitation impacts confidentiality, integrity, and availability across a changed security scope.

Critical Impact
Attackers can execute arbitrary JavaScript in victim browsers, enabling session theft, administrative action hijacking, and content manipulation within the WordPress admin context.

Affected Products

WP Data Access plugin for WordPress by Passionate Programmer Peter
All versions from initial release through 5.5.36
WordPress sites with the plugin enabled and accessible to authenticated users

Discovery Timeline

2025-04-16 - CVE-2025-39582 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-39582

Vulnerability Analysis

The vulnerability resides in client-side JavaScript within the WP Data Access plugin. User-controllable input is written into the Document Object Model (DOM) without proper sanitization or encoding. When the browser parses the injected content, it executes attacker-supplied script in the origin context of the WordPress site.

Exploitation requires an authenticated user with low privileges and user interaction, such as clicking a crafted link or loading a page containing tainted parameters. Because the security scope changes upon exploitation, injected script can affect resources beyond the vulnerable component, including administrative interfaces served from the same origin.

The EPSS score is 0.318% at the 24.98 percentile as of 2026-09-22, indicating limited observed exploitation activity to date.

Root Cause

The plugin's client-side code processes untrusted input (such as URL fragments, query parameters, or postMessage data) and inserts it into the DOM using unsafe sinks. Common sinks include innerHTML, document.write, or jQuery methods such as .html(). Absent output encoding, this pattern allows HTML and script tags to be interpreted by the browser.

Attack Vector

The attack vector is network-based. An attacker crafts a URL or web page that triggers the vulnerable DOM sink in the context of an authenticated WordPress user. The victim must interact with the malicious content, such as by clicking a link. Once executed, the injected script inherits the victim's session and can issue authenticated requests, exfiltrate cookies, or modify page content.

No verified proof-of-concept exploit code is publicly available. Refer to the Patchstack XSS Vulnerability Advisory for additional technical detail.

Detection Methods for CVE-2025-39582

Indicators of Compromise

Unexpected <script>, <img onerror=>, or event handler payloads appearing in WordPress admin page logs referencing WP Data Access endpoints
Anomalous outbound HTTP requests originating from authenticated WordPress admin sessions to attacker-controlled domains
Unusual DOM modifications or JavaScript errors within plugin pages during user sessions

Detection Strategies

Inspect web server access logs for suspicious query strings or URL fragments containing HTML tags, javascript: URIs, or encoded script payloads targeting WP Data Access URLs
Review browser Content Security Policy (CSP) violation reports for blocked inline script executions on plugin pages
Monitor WordPress audit logs for unexpected administrative actions initiated from low-privilege accounts

Monitoring Recommendations

Enable verbose logging on the WordPress installation and forward events to a centralized log analytics platform
Correlate authentication events with subsequent administrative changes to detect session hijack patterns
Alert on newly created administrator accounts, plugin installations, or theme modifications immediately following interaction with plugin pages

How to Mitigate CVE-2025-39582

Immediate Actions Required

Update WP Data Access to a version later than 5.5.36 once the vendor releases a patched build
Audit user accounts and remove or downgrade unnecessary privileges to reduce the pool of potential victims
Deploy a Web Application Firewall (WAF) rule set that filters XSS payloads targeting WP Data Access endpoints

Patch Information

Consult the Patchstack XSS Vulnerability Advisory for the latest fixed version information. Apply the vendor-supplied update through the WordPress plugin manager or by replacing the plugin directory with the patched release.

Workarounds

Disable the WP Data Access plugin until a fixed version is installed if it is not business-critical
Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources on WordPress admin pages
Restrict access to WordPress admin URLs by IP allowlist or VPN to reduce exposure to social-engineered exploitation attempts

bash

# Configuration example: restrict wp-admin access via .htaccess
<Files wp-login.php>
  Require ip 203.0.113.0/24
</Files>

<Directory /var/www/html/wp-admin>
  Require ip 203.0.113.0/24
</Directory>

# Example CSP header in Apache configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self';"