CVE-2025-31892: WP Crowdfunding Stored XSS Vulnerability

CVE-2025-31892 Overview

CVE-2025-31892 is a stored cross-site scripting (XSS) vulnerability in the Themeum WP Crowdfunding plugin for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. It affects all versions of wp-crowdfunding from initial release through 2.1.15. An authenticated attacker with low privileges can inject malicious scripts that persist on the site and execute in the browsers of other users, including administrators.

Critical Impact
Authenticated attackers can inject persistent JavaScript payloads that execute across user sessions, enabling session hijacking, credential theft, and administrative account compromise through victim interaction.

Affected Products

Themeum WP Crowdfunding plugin for WordPress
All versions from initial release through 2.1.15
WordPress sites running the vulnerable wp-crowdfunding plugin

Discovery Timeline

2025-04-01 - CVE-2025-31892 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31892

Vulnerability Analysis

The vulnerability is a stored XSS flaw in the WP Crowdfunding plugin. The plugin fails to properly sanitize and encode user-controlled input before rendering it within HTML output. Attackers submit crafted input through plugin-exposed fields, and the payload persists in the WordPress database. When another user loads a page that renders the stored data, the browser executes the injected JavaScript within the site origin.

Stored XSS is classified under CWE-79, Improper Neutralization of Input During Web Page Generation. The scope change indicated by the CVSS vector reflects that a compromised script running in a victim browser can act on resources beyond the vulnerable component. Exploitation requires user interaction, typically an administrator or logged-in user visiting a page containing the malicious content.

Root Cause

The plugin renders attacker-controlled input into HTML contexts without applying WordPress escaping functions such as esc_html(), esc_attr(), or wp_kses(). Missing output encoding allows raw HTML and <script> tags to reach the response body, where the browser parses them as executable markup.

Attack Vector

An attacker authenticated with low privileges submits a payload containing JavaScript into an input field processed by the plugin. The server stores the payload. When a victim views the affected view, the browser renders and executes the script in the site context. Successful exploitation can hijack sessions, exfiltrate cookies, perform actions as the victim, or pivot to full administrator compromise.

See the Patchstack WP Crowdfunding Vulnerability advisory for additional technical details.

Detection Methods for CVE-2025-31892

Indicators of Compromise

Presence of <script>, onerror=, onload=, or javascript: strings inside WP Crowdfunding database tables and post metadata.
Unexpected outbound requests from browsers rendering WP Crowdfunding campaign or user profile pages.
WordPress user accounts created or elevated to administrator without a corresponding audit trail entry.
Session cookies observed in web server logs being replayed from unexpected IP addresses shortly after page loads.

Detection Strategies

Scan the WordPress database for HTML event handlers or script tags in fields populated by the wp-crowdfunding plugin.
Review web application firewall (WAF) logs for POST requests to plugin endpoints containing encoded script payloads.
Enumerate installed plugin versions across WordPress inventory and flag any wp-crowdfunding version at or below 2.1.15.

Monitoring Recommendations

Enable WordPress activity logging for plugin form submissions and administrator actions.
Deploy Content Security Policy (CSP) headers in report-only mode to surface inline script execution attempts.
Alert on new administrator account creation, role changes, and modifications to wp_options from unusual sessions.

How to Mitigate CVE-2025-31892

Immediate Actions Required

Update the Themeum WP Crowdfunding plugin to a version later than 2.1.15 as soon as a fixed release is available from the vendor.
Audit existing plugin data for stored payloads and remove any records containing script tags or HTML event handlers.
Rotate credentials and invalidate active sessions for administrator accounts that accessed affected pages.

Patch Information

Refer to the Patchstack advisory for the latest patched version and vendor guidance. Verify plugin integrity after updating and monitor the WordPress plugin repository for further releases.

Workarounds

Disable the wp-crowdfunding plugin until a patched release is installed.
Restrict access to plugin submission forms using role-based access controls or IP allowlists.
Deploy a WAF rule to block requests containing <script>, onerror=, and similar XSS indicators targeting plugin endpoints.
Enforce a strict Content Security Policy that disallows inline scripts on pages rendering plugin content.

bash

# Example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate wp-crowdfunding
wp plugin status wp-crowdfunding