CVE-2025-31567: Themesflat Addons for Elementor XSS Flaw

CVE-2025-31567 Overview

CVE-2025-31567 is a stored Cross-Site Scripting (XSS) vulnerability in the Themesflat Addons for Elementor WordPress plugin. The flaw affects all plugin versions up to and including 2.3.1. It stems from improper neutralization of user-supplied input during web page generation, classified under [CWE-79]. An authenticated attacker with low privileges can inject malicious JavaScript that persists in the database. The payload executes in the browser of any user who views the affected page, including administrators. Successful exploitation requires user interaction and crosses a security scope boundary.

Critical Impact

Authenticated attackers can inject persistent JavaScript into pages rendered by the Themesflat Addons for Elementor plugin, enabling session theft, administrative action hijacking, and unauthorized content modification.

Affected Products

• Themesflat Addons for Elementor plugin for WordPress
• All versions from n/a through <= 2.3.1
• WordPress sites using the vulnerable plugin releases

Discovery Timeline

• 2025-03-31 - CVE-2025-31567 published to the National Vulnerability Database (NVD)
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31567

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting (XSS) flaw in the Themesflat Addons for Elementor plugin. The plugin accepts input from authenticated users and renders it back into web pages without sufficient sanitization or output encoding. Because the payload is persisted server-side, it executes every time a visitor loads the affected page.

Stored XSS in WordPress plugins typically allows attackers to steal session cookies, perform actions in the context of an administrator, or inject arbitrary HTML and scripts into the site. The impact extends beyond the attacker-controlled scope, which is reflected in the scope-changed CVSS metrics.

Root Cause

The root cause is improper neutralization of input during web page generation [CWE-79]. The plugin fails to apply WordPress sanitization helpers such as wp_kses_post(), esc_html(), or esc_attr() on user-supplied values before rendering them. Fields handled by Elementor widgets or plugin settings are stored verbatim and emitted into the HTML response.

Attack Vector

Exploitation requires an authenticated user with at least contributor-level privileges to submit a crafted payload through a vulnerable plugin input field. The payload is stored and later executed when another user, typically an administrator or site visitor, renders the page. User interaction is required to trigger the payload. The vulnerability is reachable over the network via standard WordPress HTTP requests.

No verified public proof-of-concept code is available. See the Patchstack XSS Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-31567

Indicators of Compromise

• Unexpected <script>, <iframe>, or onerror= strings stored in WordPress post content, postmeta, or Elementor widget settings tables
• Outbound HTTP requests from administrator browsers to unknown third-party domains after loading pages built with Themesflat widgets
• New or modified administrator accounts created shortly after an authenticated low-privilege user edited plugin-rendered content
• Unusual JavaScript execution originating from pages that use Themesflat Addons for Elementor widgets

Detection Strategies

• Query the WordPress database for stored HTML entities and script tags in wp_postmeta keys used by the plugin
• Review web server access logs for POST requests to Elementor editor endpoints originating from contributor or author accounts
• Inspect rendered pages with Content Security Policy (CSP) report-only mode to identify unexpected inline scripts
• Correlate authenticated editor activity with subsequent anomalous administrator session behavior

Monitoring Recommendations

• Enable WordPress audit logging to track plugin and post modifications by non-administrator roles
• Monitor browser-side telemetry for script execution anomalies on /wp-admin/ pages
• Track installed plugin versions across managed WordPress properties and flag any installation at or below 2.3.1
• Alert on sudden spikes in editor-role activity against sites running the affected plugin

How to Mitigate CVE-2025-31567

Immediate Actions Required

• Update Themesflat Addons for Elementor to a release later than 2.3.1 as soon as the vendor publishes a fixed version
• Audit user roles and remove unnecessary contributor, author, or editor accounts
• Review existing posts and widget configurations for injected scripts and remove malicious content
• Rotate administrator credentials and invalidate active sessions if compromise is suspected

Patch Information

A fixed version addressing CVE-2025-31567 should be obtained directly from the plugin vendor. Consult the Patchstack XSS Vulnerability Report for the current remediation status. If no patch is available, deactivate and remove the plugin until a fix is released.

Workarounds

• Deactivate the Themesflat Addons for Elementor plugin until a patched release is available
• Restrict content submission permissions to trusted administrators only
• Deploy a Web Application Firewall (WAF) rule to block common XSS payloads submitted to Elementor editor endpoints
• Enforce a strict Content Security Policy (CSP) that disallows inline scripts on WordPress-rendered pages

# Configuration example: enforce a restrictive CSP via Apache
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"