CVE-2025-14113: WordPress Viitor Button Shortcodes XSS Flaw

CVE-2025-14113 Overview

The Viitor Button Shortcodes plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the link shortcode attribute affecting all versions up to and including 3.0.0. The vulnerability stems from insufficient input sanitization and output escaping, allowing authenticated attackers with Contributor-level access or above to inject arbitrary web scripts into pages. These malicious scripts execute whenever any user accesses the compromised page, potentially leading to session hijacking, credential theft, or further exploitation of the WordPress installation.

Critical Impact

Authenticated attackers can inject persistent malicious scripts that execute in victims' browsers, enabling session hijacking, credential theft, and unauthorized actions on behalf of legitimate users.

Affected Products

• Viitor Button Shortcodes plugin for WordPress versions up to and including 3.0.0
• WordPress installations using the vulnerable plugin versions
• All users with access to pages containing injected malicious content

Discovery Timeline

• 2026-01-07 - CVE-2025-14113 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-14113

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability exists within the shortcode processing functionality of the Viitor Button Shortcodes plugin. The root issue lies in how the plugin handles the link attribute within shortcode implementations. When users with Contributor-level permissions or higher create or edit content containing the button shortcode, the link attribute value is not properly sanitized before being stored in the database or escaped when rendered to the page.

The vulnerability requires authentication with at least Contributor privileges, which limits the attack surface compared to unauthenticated vulnerabilities. However, once exploited, the malicious payload persists in the database and executes for every user who views the affected page, including administrators. This persistence makes it particularly dangerous as the attack continues until the malicious content is identified and removed.

Root Cause

The vulnerability originates from missing or inadequate input sanitization on the link shortcode attribute combined with insufficient output escaping when rendering the attribute value. The affected code in class-ww-vcsc-shortcodes.php at line 51 processes user-supplied input without proper WordPress escaping functions such as esc_url() or esc_attr(). This allows JavaScript payloads embedded in the link attribute to be stored and later executed in the browser context of any user viewing the page.

Attack Vector

The attack is network-based and requires the attacker to have authenticated access to the WordPress site with at least Contributor-level permissions. The attacker crafts a malicious shortcode with JavaScript embedded in the link attribute. When saved, this payload is stored in the WordPress database. Subsequently, when any visitor (including administrators) views the page containing the malicious shortcode, the injected script executes in their browser session.

A typical attack scenario involves an attacker creating or editing a post/page and inserting a button shortcode with a crafted link attribute containing JavaScript event handlers or protocol handlers designed to execute arbitrary code. The stored nature of this XSS means the payload persists and affects all subsequent page views until remediated.

Detection Methods for CVE-2025-14113

Indicators of Compromise

• Unexpected JavaScript code appearing in post content containing Viitor Button shortcodes
• Suspicious link attribute values in shortcodes containing javascript:, event handlers like onclick, or encoded payloads
• User reports of unexpected browser behavior when viewing pages with button shortcodes
• Anomalous activity in WordPress audit logs showing shortcode content modifications by contributor-level users

Detection Strategies

• Review WordPress content for shortcodes with suspicious link attribute patterns including javascript: protocol, HTML event attributes, or encoded characters
• Implement Web Application Firewall (WAF) rules to detect XSS payloads in shortcode attributes during content submission
• Enable and monitor WordPress audit logging for content changes by users with Contributor or Author roles
• Perform regular security scans of stored content using WordPress security plugins

Monitoring Recommendations

• Deploy endpoint detection solutions capable of identifying malicious JavaScript execution patterns in browser contexts
• Configure Content Security Policy (CSP) headers to restrict inline script execution and report violations
• Monitor for unusual session activity that may indicate session hijacking following XSS exploitation
• Implement real-time alerting for modifications to pages containing the affected shortcodes

How to Mitigate CVE-2025-14113

Immediate Actions Required

• Audit all existing content using Viitor Button Shortcodes for potentially malicious link attribute values
• Temporarily restrict Contributor-level users from creating or editing content containing the vulnerable shortcode
• Consider temporarily disabling the Viitor Button Shortcodes plugin until a patch is available
• Review recent content changes by Contributor and Author users for signs of exploitation

Patch Information

At the time of publication, users should monitor the Wordfence Vulnerability Report for updates on available patches. The vulnerable code can be reviewed in the WordPress Plugin Code Review at the WordPress plugin repository. Update to a patched version as soon as one becomes available from the plugin developer.

Workarounds

• Implement server-side input validation to sanitize shortcode attributes before storage, using WordPress escaping functions like esc_url() and esc_attr()
• Deploy a Web Application Firewall with rules specifically targeting XSS patterns in POST data and shortcode content
• Restrict the ability to use the Viitor Button Shortcodes to trusted administrator-level users only
• Enable Content Security Policy headers to mitigate the impact of any successful XSS injection

# Example .htaccess configuration to add CSP headers
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>